Version bumped to 0.2.0

Simplified the name of the app to QmlDemo. Set clang compiler to ignore gun-statement-expression warnings, to enable the likes of cassert.

Should work more properly.
Now needs to be initialized.

Missing GL Context (de) and activation,
as well as selection.

Refactored GLSceneRenderer into {RCPair,Texture}Renderer structure, added a QML TextureViewer component.

Added a scenario structure to simplify quick and clear rapid prototypeing and to 'gmstudio' structure.