various fixes towards LegacyCapture

- sniper using Captures, but churches using LegacyCapturable
- unable to parse CaptureThreshold/SabotageHPRemoval from yaml
- not firing up INotifyCapture and breaking:
  * sniper transforming the church on capture in ra
  * proc not giving away it's contents in cnc
Merge pull request #3465 from Mailaender/legacy-capture-fixes

Various fixes towards LegacyCapture