* Force multi-hit moves to hit once if they are against an immune type
* Add test for multi-hit attacks against immune types
* Document MultiHitAttr
* Tiny change
* Wording fix
* Use shortcut methods in unit tests
* Fix leftover modifications from METRONOME testing
* Reorganize SAP SIPPER tests
* Fix extra imports
* Fix type immunity given by abilities only applying to attacking moves
* Add tests for type immunity granted by abilities
* Use Sap Sipper as base for testing
* Fix type-immunity abilities activating on self-targeted status moves
* Add tests for self-targeted moves on mons with type-immunity abilitiies
* Volt absorb tests
* Fix type immunity given by abilities only applying to attacking moves
* Add tests for type immunity granted by abilities
* Use Sap Sipper as base for testing