Rename standard library functions

[hdwalters]

Rename standard library functions for internal consistency and transparency.
Rename test scripts to match, and prefix with array_ etc where not already done.

File      New Name              Old Name              Changed
--------- --------------------- --------------------- --------
array.ab  array_contains        includes              Yes
array.ab  array_extract_at      extract_at            Yes
array.ab  array_find            array_first_index     Yes
array.ab  array_find_all        array_search          Yes
array.ab  array_first           first                 Yes
array.ab  array_last            last                  Yes
array.ab  array_pop             pop                   Yes
array.ab  array_remove_at       remove_at             Yes
array.ab  array_shift           shift                 Yes
--------- --------------------- --------------------- --------
date.ab   date_add              date_add              -
date.ab   date_compare          date_compare          -
date.ab   date_now              now                   Yes
date.ab   date_posix            date_posix            -
--------- --------------------- --------------------- --------
env.ab    bold                  text_bold             Yes
env.ab    echo_colored          color_echo            Yes
env.ab    echo_error            error                 Yes
env.ab    echo_info             echo_info             -
env.ab    echo_success          echo_success          -
env.ab    echo_warning          echo_warning          -
env.ab    env_const_get         shell_constant_get    Yes
env.ab    env_const_set         shell_constant_set    Yes
env.ab    env_file_load         load_env_file         Yes
env.ab    env_var_get           shell_var_get         Yes
env.ab    env_var_load          get_env_var           Yes
env.ab    env_var_set           shell_var_set         Yes
env.ab    env_var_test          shell_isset           Yes
env.ab    env_var_unset         shell_unset           Yes
env.ab    escaped               printf_escape         Yes
env.ab    has_failed            has_failed            -
env.ab    input_confirm         confirm               Yes
env.ab    input_hidden          input_hidden          -
env.ab    input_prompt          input                 Yes
env.ab    is_command            is_command            -
env.ab    is_root               is_root               -
env.ab    italic                text_italic           Yes
env.ab    printf                printf                -
env.ab    styled                text_shell            Yes
env.ab    underlined            text_underlined       Yes
--------- --------------------- --------------------- --------
fs.ab     dir_create            create_dir            Yes
fs.ab     dir_exists            dir_exist             Yes
fs.ab     file_append           file_append           -
fs.ab     file_chmod            make_executable       Yes
fs.ab     file_chown            change_owner          Yes
fs.ab     file_exists           file_exist            Yes
fs.ab     file_extract          extract               Yes
fs.ab     file_glob             glob                  Yes
fs.ab     file_glob_all         glob_multiple         Yes
fs.ab     file_read             file_read             -
fs.ab     file_write            file_write            -
fs.ab     symlink_create        create_symbolic_link  Yes
--------- --------------------- --------------------- --------
http.ab   file_download         download              Yes
--------- --------------------- --------------------- --------
math.ab   math_abs              abs                   Yes
math.ab   math_ceil             ceil                  Yes
math.ab   math_floor            floor                 Yes
math.ab   math_round            round                 Yes
math.ab   math_sum              sum                   Yes
--------- --------------------- --------------------- --------
text.ab   capitalized           capitalize            Yes
text.ab   char_at               char_at               -
text.ab   ends_with             ends_with             -
text.ab   join                  join                  -
text.ab   lowercase             lower                 Yes
text.ab   lpad                  lpad                  -
text.ab   match_regex           match_regex           -
text.ab   match_regex_any       match_any_regex       Yes
text.ab   parse_number          parse                 Yes
text.ab   replace               replace               -
text.ab   replace_one           replace_once          Yes
text.ab   replace_regex         replace_regex         -
text.ab   reversed              reverse               Yes
text.ab   rpad                  rpad                  -
text.ab   slice                 slice                 -
text.ab   split                 split                 -
text.ab   split_chars           chars                 Yes
text.ab   split_lines           split_lines           -
text.ab   split_words           words                 Yes
text.ab   starts_with           starts_with           -
text.ab   text_contains         contains              Yes
text.ab   text_contains_all     contains_all          Yes
text.ab   text_contains_any     contains_any          Yes
text.ab   trim                  trim                  -
text.ab   trim_left             trim_left             -
text.ab   trim_right            trim_right            -
text.ab   uppercase             upper                 Yes
text.ab   zfill                 zfill                 -

[hdwalters]

Added mode parameter because users are likely going to want to do more than just set the executable bit.

[hdwalters]

Swapped path and user parameters because all other file functions have the filename as the first parameter.

[Mte90]

We need to docuument those changes for 0.4.0