Cleaned up eglbringuptest code
- Refactored CEGLRendering construction to separate EGL and VG setup
- Consistently check EGL and VG errors after each API call
- Standardised RDebug::Printf statements to all start with [EBT]
- Removed unused libraries from MMP file
- Removed unused openvgengine.h
- Removed various unused member variables
- Removed unused CWsCanvas class
Added a timer which kills eglbringuptest.exe after a short delay
This is to allow the app to be used on a real device. Because it
is a console app, there is no way to kill the application once it
is running.