Added VSync and windowed fullscreen options

The configuration and setup UI were adjusted to the new options.
This also fixes issues in applying new video settings.

Default resolution was changed from 800x600 to 1280x720. VSync is
enabled by default while FPS limit was disabled.

Display aspect ratio for the resolution options.

I had to work around some macOS issues:

* Don't change window size when it appears to be "maximized", since it
  just changes the rendering area while leaving the window maximized.

* Unset fullscreen display mode temporarily to allow changing resolutions,
  otherwise the rendering area no longer matches the screen and mouse
  input is also off.

* Removed SDL_WINDOW_ALLOW_HIGHDPI for now because it causes issues on
  macOS, since we're not actually handling the scaling factor.

A Video class and an SDLGraphics subclass were split off from Graphics.
This setup has Less duplication and leaves the OpenGLGraphics and
SDLGraphics better separated.

Fixes #57
Fixes #58

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