Remove BackendTexture, BackendRenderTarget and BackendSemaphore from tgfx.

[domchen]

No description provided.

[codecov-commenter]

Codecov Report

Merging #135 (8c84fba) into main (f2a00b3) will decrease coverage by 0.10%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #135      +/-   ##
==========================================
- Coverage   63.98%   63.88%   -0.11%     
==========================================
  Files         562      562              
  Lines       26699    26654      -45     
  Branches     7507     7513       +6     
==========================================
- Hits        17084    17027      -57     
+ Misses       4832     4804      -28     
- Partials     4783     4823      +40     

Impacted Files	Coverage Δ
libpag/src/rendering/Drawable.cpp	41.66% <0.00%> (-22.62%)	⬇️
libpag/src/rendering/filters/utils/FilterBuffer.h	87.50% <0.00%> (-12.50%)	⬇️
libpag/tgfx/src/gpu/opengl/GLUniformHandler.cpp	47.45% <0.00%> (-10.88%)	⬇️
...rc/gpu/opengl/GLQuadPerEdgeAAGeometryProcessor.cpp	60.86% <0.00%> (-10.87%)	⬇️
libpag/tgfx/src/gpu/opengl/GLTexture.cpp	68.54% <0.00%> (-9.81%)	⬇️
libpag/tgfx/src/gpu/Surface.cpp	77.77% <0.00%> (-9.73%)	⬇️
libpag/tgfx/src/gpu/TextureFragmentProcessor.cpp	64.70% <0.00%> (-8.83%)	⬇️
libpag/tgfx/src/gpu/GLFragmentProcessor.h	89.28% <0.00%> (-7.15%)	⬇️
libpag/tgfx/src/gpu/opengl/GLDrawer.cpp	62.65% <0.00%> (-5.65%)	⬇️
libpag/tgfx/src/gpu/opengl/GLRenderTarget.cpp	56.68% <0.00%> (-5.12%)	⬇️
... and 69 more

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