many new player features

[kajott]

This PR contains a few improvements and changes to the player I made in the last few days, which I hope are useful for inclusion in upstream. The editor isn't affected at all, and the only change in Core is in ContextSettings.

• Added a "pre-cache" option that renders the first, center and last frame of each TimeClip in reverse order invisibly at the end of precalc (last 10% of the progress bar). This makes scene transitions (especially at the beginning of the demo) much smoother on most systems.

• Exiting the player is now delayed by 2 seconds after the music stops.

• The look of the configuration UI has been modernized and made more consistent:

  • dark background colors taken from Tooll itself; well-readable foreground color
  • flat button style
  • using the Vista/7/8/10 system font instead of the Windows 95 one
  • aligned numbers in resolution selector
  • resizable dialog, no unneccesary vertical space

• Added an automatic aspect ratio setting and some new aspect ratio presets.

• Every option is now accessible via the command line.

• "Textures.bin" is now "logs/ResourceDescriptions.json".

[drcynic]

Pretty cool changes/fixes, for me especially the command-line options, thanks a lot keyj!