v1.3.0

v1.3.0 - BIG update, here's a list of some of the fixes:

• Features
  • Don't draw if a surface/texture doesn't exist (avoids white boxes flashing)
  • Add ability to draw at depth
  • Can draw in Draw event
• API
  • Added float4 -> gml color conversion functions
• Fixes:
  • imguigml_texteditor_get_text returned nothing, also fixed indexing text editors
  • Fixed ImGuiGML bashing the cursor so that resize cursors, etc, didn't function properly.
  • Fixed ImGuiGML Display Issues when resizing the window or GUI Layer... more to come on this
• Various doc fixes!