Update WindowState saving & loading
Large commit

- Changes property list to a ListView, instead of UserControls
- Move reset default to ListView's ContextMenu
- Some other things. Don't remember anymore
Large (another) commit

- Moved classes out of Controls folder, since they're no longer
UserControls
- Fixed button positions
- Replaced MainMenu with MenuStrip. MainMenu causes too much problems
- Given credit to ListViewEx creator