Changes

Make FBObject more generic, split FBO/tex and depth/stencil attachements. Allow parametrization of each component.

GLContext: Added java.debug.DebugGL and java.debug.TraceGL to enable debug and trace pipeline.

ShaderProgram: Add 'init(GL2ES2)', allowing GL program object creation before link stage.
This is required to allow proper usage of 'glBindAttribLocation()'.

Fix: Use new FBObject; Use shaderProgram.program() instead of shaderProgram.id()

The new FBObject handles state transition more easily and it's usage is less complex
to the caller - compared to inline usage.

Use shaderProgram.program() instead of shaderProgram.id() - the id() is just a unique sequence name.

Fix: shaderProgram.program(); glBindAttribLocation() call; dispose/disposeImpl sequence;

Use shaderProgram.program() instead of shaderProgram.id() - the id() is just a unique sequence name.

Call glBindAttribLocation() after program object init and before linkage.

Chain call disposeImpl() properly to fix destruction sequence:
  TextRendererImpl01 -> TextRenderer -> GlyphString -> Region
  RegionRendererImpl01 -> RegionRenderer -> Region

Fix: DEBUG field (regression)