Core/MMAPs: Improve NPC behavior with fences and high climbs

Increase the max walkable angle and max walkable climb in MMAPs generator to allow NPCs to jump on fences and climb steps.
This requires MMAPs to be extracted again with mmaps_generator, old extracted MMAPs are still compatible but will not provide the benefits of this commit.
Fixes #9965
DB/Quest: Script replacement of/or issueing of items needed for quests

By dr-j closes #11901
DB/Quest: Plundering the Plunderers

By dr-j, closes #11902
Scripts/Ruby Sanctum: Fixed corporeality scaling changes.

Thanks to Unholychick.

P.S.: #9231 if still valid will be fixed soon (tm)
Rename 2014_04_19_world_misc.sql to 2014_04_19_00_world_misc.sql
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().