Restore the main changes made in renderer.rs

[dati91]

• Data uploading Bring back TextureUploader #148
• VertexDataTexture Restore VertexDataTexture usage #154
  • node_data_texture, local_clip_rects_texture, render_task_texture
  • We store them in device.rs at the moment
• CacheTexture Restore cache texture #155
  • the texture data is in device.rs
• CacheBus
  • We only support the PixelBuffer part, and the buffer is stored in device.rs
  • The Scatter part needs a pipeline implementation
• DebugRenderer
  • It needs a pipeline
• GpuProfiler
  • it is very gl specific at the moment

[dati91]

• Dither
  • We store it in device.rs at the moment

[zakorgy]

• Angle shader validation
  • This part is commented out, because we are doing the shader validation in the build script, and we didn't need the build_shader_strings function anymore, but this part uses it. After Truly alternative backend #145 is done, we can have that function back and run the validation with the original backend.
• VertexAttribute, VertexAttributeKind, VertexDescriptor
  • We extract these datas from the shaders in the build script.