Alpha 0.19 is out!

Fixes: 
- screen blackening could be stopped via spamming LMB on Diego,
- player could get stuck in front of Diego,
- fixed screen flickering in caves,
- resized screen blackening canvas to support resolutions above FullHD
Changes:
- changed hero's hit sounds
- added berry bushes & berries
- added voidweed
- added crates
- water is now animated
- items from destroyed objects drop in radius
- secrets ;)