Core/Misc: Ensure GetVictim() returns a valid reference when expected

Add a new method EnsureVictim() which asserts a valid not NULL reference will be returned to the caller. Use this whenever the GetVictim() would be dereferenced .
Core/Misc: Check GetVictim() for NULL before dereferencing it

Add additional NULL checks all around the code before dereferencing GetVictim() result.
Keep in mind UpdateVictim() result has nothing to do with GetVictim() result and the caller shouldn't assume anything about GetVictim() based on UpdateVictim().
DB/Creature: Fix Birgitte Cranston

By untaught, closes #11842
DB/Creature Text: Add texts for Injured Soldiers

By untaught closes #11872
NOTE: don't posts multiple unrelated bugs on a single ticket.
Tools: Enabled struct packing to ensure that structures are read from files properly
Core/Misc: Fix change faction on dead Night Elves keeping the speed buff

Fix change faction on dead Night Elves causing the new player keeping the 175% wisp speed buff.
Players will be resurrected automatically on change faction.
Closes #255
Core/Misc: Fixed some -Weffc++ warnings
Repository: Set line endings in .patch/.diff files to LF via .gitattributes
DB/Creature: Fix Earthcaller Ryga

By untaught, closes #11827
DB/Misc: Adition to 29dccd9

By dr-j, closes #11911