Added drafts for road/river editing actions
Split map actions Unit
Fix brush mode selection, disable unimpemented mode
Added GUI for road/river editing
Stub-plemented road editing (no transitions yet)
WIP on road transitions
Fix road transitions
WIP on river editing
Fix river editing
Draw hovered tile also in road/river mode, fix river transitions
fix road/river action caption
Small redesign
Draw roads/rivers always connected
Fix drawing road outside of map
Do not draw road cursor if road is not plasable
Fix minimap redraw