Crop hotkey action icon overlays to 18x18 when used as menu entries.
New "End Turn" button from LordBob.
New minimap image from LordBob.
Adjusments for the new minimap and end turn graphics.
Adjust the id and terrain string for "Trash and litter" terrain.

Also sorts the terrain to not show it at the top of the palette.
Fixes https://gna.org/bugs/index.php?21447
Change the selection tool to deselect with strg+left click.

Fixes bug https://gna.org/bugs/?20878