Enhance text status and allow to change debug geometry at run time

Improvement to DebugGeometry:

• Debug geometries can be changed at run time.
• DebugRenderingExample has been rewritten, such that the geometries (points, lines, triangles) are continuously and randomly added/removed from the scene

Improvement to text status:

• Text status now has FPS text status and a custom text status
• They can be placed at one out of four corners of the window
• The font size and font color can be changed
• Status can be multiple lines

Note: This MR is after !336 (closed)