NEXT: Fix Intrinsics

Update Intrinsics to be bypassed by Mold Breaker and its variants.
NEXT: Fix Slash, add Signature Hidden Power Unown

Update Slash to return this.chainModify, fixing a bug where it was not being boosted by Technician.
Add Hidden Power Unown.
NEXT: Fix Shadow Tag

Update Shadow Tag to wear off onBeforeMove, instead of simply having a duration of 1, fixing a bug where Shadow Tag would wear off the same turn Unown switched in if it was not after having a Pokemon faint.
Merge pull request #1208 from NickMP/patch-18

NEXT: Fix Intrinsics/Shadow Tag/Slash | Add Sig HP Unown