Update ZAPD to use scene macros, improve texture system and others

[AngheloAlf]

• What's new in ZAPD:
  • Add Mtx extraction 105.
  • Code refactor 108, 136 and 132.
  • Add a XML extraction reference 102
  • Deprecate Hint system 116.
  • Warn unaccounted and name small zero-only unaccounted as padding 118.
  • Texture pool 123.
  • Add ZString resource 130
  • Use libpng¹, palettized textures update and other texture-related improvements 133
  • ZRoom refactor: use macros, improve output and more 124.
  • Check XML resource attributes. 126
  • A few Limbs, Skel and CurveAnimation fixes. 146
  • Hotfix: fix AnimatedMaterial and Minimap extraction 139
  • Add documentation for ZAPD parameters 141
  • Among other changes².
• A few other small macro fixes, add a missing structure and update XMLs.

Edit:
This PR is on hold until this hotfix get merged in ZAPD repo.

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¹ libpng is now a dependency of ZAPD. To install it in a Debian/Ubuntu environment use

sudo apt update
sudo apt install libpng-dev

² For complete list of ZAPD PRs since the last version, see here.

[AngheloAlf]

This PR whill be on hold until this hotfix get merged in ZAPD repo.

[AngheloAlf]

• Update:
  • Check XML resource attributes. 126
  • A few Limbs, Skel and CurveAnimation fixes. 146
  • Hotfix: fix AnimatedMaterial and Minimap extraction 139
  • Add documentation for ZAPD parameters 141