Cleanup of OpenGlApplication/Runtime initialization

[luithefirst]

There are 3 OpenGlApplications: WinForms, WPF, Slim

The cleanup is work in progress and here is the documentation of the changes:

1. Each has a slightly different initialization routine. The WPF one initializes lazy when a RenderControl is created, while the others also have the lazy initialization mechanism, but do not use them -> unify

2. The construction of an application will always create a default shader cache folder -> constructor argument

3. Construction of Runtime always uses a null Context, the setter of Context will also initialize the GLVM, which is redundant to the initialization in the Applications -> remove Context from the constructor and move everything to the unified initialization method

4. Add validation of OpenGl version and error handling (Improve error reporting when library function cannot be loaded #64) -> unified initialization method