Engine:
* Lowered the number of feathers spawned by Birdy
* Made hogs caugh/moan once they lose health due to poison - no longer random
Frontend:
* Modified game scheme editor to lookup the number of default ammoschemes (no longer hardcoded)
* Added new default game schemes: Barrel Mayhem, Tunnel Hogs
* Added new default weapon scheme: Tunnel Hogs
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