DB/Quest: Further Conversations

Update after https://github.com/TrinityCore/TrinityCore/commit/84fdc55db85ac36f6a570d17402572d71412a9d9 as this was failing to give quest credit

* Fix quest credit for this quest was failing due to using target 7, works with 23
* The Erratic sentrys will now despawn when hit by spell rather than letting player summon 5 erratic sentrys from one mob
README: Update 3.3.5 build status badge

(cherry picked from commit 708e36c920cb337eb39b020937d417b02a37d4a8)

Conflicts:
	README.md
Scripts/MoltenCore: Fix logic at Ragnaros' Magma Blast casts

(should only be cast while the main target is not in melee range)
Merge remote-tracking branch 'upstream/3.3.5' into 3.3.5