cumulative patches + cleanup

[digant73]

IMPROVEMENTS:

• cumulative patches/improvements: it includes some fixes/improvements provided up to PR Simple, efficient. fast, low resource DMA TX #2844. They have been refined/fixed here and there to be fully working. All credits to kisslorand
• cumulative cleanup: cleanup on different files just to remove from .h files useless references to functions invoked only internally on related .c files. Order of functions have been changed in .c files just to make cleanup on related .h files. inline function qualifier used when needed to reduce code size
• other minor improvements/cleanup

BUGFIXES:

• [BUG] Display menu names #2881
• wrong allocated array for monitoring 4 heaters (such as 2 hotend+bed+chamber), displayed as persistent info on title bar, with possible unpredictable side effects (e.g. freezes)

fixes #2881 and wrong allocated buffer for temperature monitoring
fixes #2855
fixes #2854 (FR already implemented)
fixes #2851 (not an issue)
fixes #2849
fixes #2815
fixes #2814 (answer provided)
fixes #2786 (replaced by 2853)
fixes #2797

PR STATE: ready for merge

[rondlh]

I think this also fixes #2804

[digant73]

I think this also fixes #2804

#2805 should be enough to fix your issue reported in #2804 (let me know if it was not enough to completely fix your issue and this PR fixes it) but it is not able to handle 4 heaters such as 2 hotend+bed+chamber. In particular, an invalid access in main memory (array defined as static in loopTemperatureStatus function) is performed with possible unpredictable side effects.

[rondlh]

I think this also fixes #2804

#2805 should be enough to fix your issue reported in #2804 (let me know if it was not enough to completely fix your issue and this PR fixes it) but it is not able to handle 4 heaters such as 2 hotend+bed+chamber. In particular, an invalid access in main memory (array defined as static in loopTemperatureStatus function) is performed with possible unpredictable side effects.

Correct, #2805 is enough, but #2873 seems to supersedes it and #2804 is not merged, and should probably not be merged anymore after #2873.