refactor: redesign the graphics library API

[commit-lint[bot]]

Code Refactoring

• redesign PandaGL library (86c5802)
• update rect and canvas API (8dbea59)
• pandagl: renames the line drawing function (4b13ed3)
• pandagl: replace pd_painter_t with pd_context_t (df13dbb)

Tests

• pandagl: add tests (f656122)

Contributors

lc-soft

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[codecov[bot]]

Codecov Report

Merging #281 (6189a88) into v3.0-dev (dcf533e) will increase coverage by 0.72%. The diff coverage is 40.09%.

@@             Coverage Diff              @@
##           v3.0-dev     #281      +/-   ##
============================================
+ Coverage     50.64%   51.37%   +0.72%     
============================================
  Files            93      103      +10     
  Lines         15193    14932     -261     
============================================
- Hits           7695     7671      -24     
+ Misses         7498     7261     -237     

Impacted Files	Coverage Δ
lib/image/src/bmp.c	79.10% <ø> (ø)
lib/image/src/jpeg.c	68.42% <ø> (ø)
lib/image/src/png.c	43.22% <0.00%> (+2.61%)	:arrow_up:
lib/image/src/reader.c	67.36% <ø> (ø)
lib/pandagl/include/pandagl/color.h	0.00% <0.00%> (ø)
lib/pandagl/src/context.c	0.00% <0.00%> (ø)
lib/pandagl/src/flip.c	0.00% <0.00%> (ø)
lib/pandagl/src/line.c	0.00% <0.00%> (ø)
lib/pandagl/src/tile.c	0.00% <0.00%> (ø)
lib/pandagl/src/zoom.c	0.00% <0.00%> (ø)
... and 35 more

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