avmediaogl: Use glTFHandle for size values

Change-Id: I4741374ec269a5513214c6603e3e6956231bd853
avmediaogl: Use INetURLObject for URL operations

Change-Id: I7b9763489ca7ec64051b53b87ab1475167ffeb35
vclopengl is buildable on all platforms now

Change-Id: I2d65035eb30e9a96ab4ddc695fc7bc3aaaa9ab6c
OpenGLContext: Provide all data for SystemChildWindow creation.

Change-Id: I7a0ceee6c784af8240fb908f19622d4ede1f5a6a
OpenGLContext: use generateWinData inside window initialization

Change-Id: I618dacceb88ddab1ca6d45a8669199354e4b6a6d
avmedia: create a special SystemChildWindow for 3D models

Change-Id: Id5f5ba2cf72ea78506ba226b269fae59b1163858
First try to render OpenGL content in a window

Change-Id: Ibb7178330d356806cea2cfc972b361167d5a9340