Rogue with the Dead: Idle RPG

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- Added a filter function for Einherjars
- Fixed a bug that prevented the pigmy drummers to receive the correct amount of EXP
- Fixed a bug that prevented the autosave to trigger after rebirth under certain conditions
- Changed the "★+1 AP to all soldiers" artifact contained in the "Soldier Training Pack" so that it also applies to Einherjars
- Other minor fixes and improvements