move library to the lib-folder
add a gitignore-file
linux: build example_bass directly in it's source dir

That's where it's data-files are anyway.
move librocket-stuff to lib-folder

While we're at it, move the sync_player.vcproj to lib/librocket.vcproj
as well.
rename sync_player.lib to librocket[-player][d].lib

This makes the UNIX version and the Windows versino a bit more
similar, and allows a single batch-build without any copying
to create a complete binary release of the libs.