adds:
- int getIndexByColor( int color )
- comments

Signed-off-by: mrzl <lzrm@mrzl.net>
adds lots of comments to the ControlFrame class

Signed-off-by: mrzl <lzrm@mrzl.net>
adds the Grid class

Signed-off-by: mrzl <lzrm@mrzl.net>
adds comments to the Line class

Signed-off-by: mrzl <lzrm@mrzl.net>
- fixes the save/load issue
- adds comments
- now for every line two clicks are necessary.

Signed-off-by: mrzl <lzrm@mrzl.net>
- some refactoring, nothing special. intellij is great.

Signed-off-by: mrzl <lzrm@mrzl.net>