Implement CHECK_EXIST_EVENT (#605)

Implement CHECK_EXIST_EVENT (#605)

* Implement CHECK_EXIST_EVENT

* Implemented the logic for CHECK_EXIST_EVENT
* Moved it out of #if0 in LOGIC_ELSE.cpp (also moved forgotten CHECK_EMPTY_SLOT)

* Added QuestState to globals.h

* Reworked the logic for checking the event
* We return true when we want to check wether the event was not started

* Minor cleanup and behavioural tweaks

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Co-authored-by: twostars <i.am.twostars@gmail.com>

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