Second implementation of Sandworms

Fix tabs in AttackSwallow.cs
Step three in implementing sandworms

Removed/fixed comments

Code style fixes

Fixed AttackWander, addressed style nits

Fix Travis crash
Improved visuals, added WormSign norification
Add RadarPing on worm spawn, fix wandering issue, add new Wormspawner.shp
Add WormAttack notification, fix worm min count and spawn interval

Enhance usage of WormManager Minimum and Maximum properties, add escape radius to AttackSwallow
Merge pull request #6821 from penev92/bleed_sandworm

Closes #2245