Merge pull request #38 from KevinW1998/master

Some new functions!
Added illustrating images
Added more info
Remove UI files as superfluous

This files always creating automatically on building process
Remove UI files as superfluous

This files always generating automatically
Small update of NPC's name
Context menu test

Probe for found reason for context-menu bug
(if item not selected, and try to move mouse, all items, contacted with
cursor, will be placed out into random position)
Ouch!!!

Forgot to define grid offset for vegetables NPC's
Custom NPC grid-offset calculator improved

Fixed calculating grid offset for small NPC's, what have size<gird.
Fix propeller block's grid offset
This NPCs must be Foreground
Added level section resizer
New files / fixed Mac OS X icon placement
Merge pull request #54 from Wohlstand/master

Merge to Update 54