Documentation update
Updates to the enumeration headers

- Also updated the tools for generating the enumeration headers.
Merge branch 'release-0.51.0' into develop
Minor documentation updates
Added the OutputData class and updated Texture
Bugfixes in text-rendering
Backporting to Android + GLES v3
Added wrappers for KHR_blend_equation_advanced
Minor updates in ProgVar
Documentation updates
Documentation update
Documentation update
Refactored Object added ObjHandle
Started release-0.52.0
Updated changelog and readme
Merge branch 'release-0.52.0'