DB/SAI: fixed target_type of spell Vampire Rush, added in my previous commit.
I have used target_type, which caused that NPC used the spell on all players in range, that's wrong.
Core/Networking: Catch possible boost exception in StartNetwork

Closes #13557

(cherry picked from commit 3eb120ab507aa65e452d21a63ff500254129c262)
CMake/FindBoost: Fix policy CMP0054 warning (added in 3.1)

(cherry picked from commit 7e6dadfea68836cc92aaa7e1bb770be620225aa2)
DB/Misc: Misc Fixes

* Fix an error with spellfocus with previous conditions
* Battle for Hilsbrad so previous quest links to correct quest and not one which is disabled as depreciated quest,  ie quest 14351 replaced quest 550 but tc still had quest 550 set as next quest quest for 541 and was missing creature_queststarter entry for correct quest
* Crusader Bridenbrad phasing (should be visible for a tale of valor)