different color themes in mulitple windows.

use case:

- many different projects with similar file structure in many opened windows

- sublime displays project name only in the title bar if no file is opened

- hard to tell which project belongs to which window

idea:

- allow assignement of color theme in the sublime-project file.

- so every project is opened with it's own color theme

- you can see immediatly what's the meaning of this window