(visuOgreQt): intel mesa regressions

What does this MR do?

• Fix regressions when using intel mesa GPU following the context handling MR (!249 (merged))
• Handle buffer swapping manually instead of relying on ogre.

How to test it?

• Run OgreViewer

Additional tests

• Linux + Mesa drivers (intel)
• Linux + Nvidia proprietary drivers
• Windows + Nvidia
• Windows + Intel

Associated Issues/Merge Requests

• Issues

  • Fixes #401 (closed)

• Merge requests

  • Depends on !287 (merged)