plugindesc v1.12 (Requires YEP_BattleEngineCore.js) Basic functions are
* added to the Battle Engine Core's action sequences.
COMMON EVENT: X
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* Plays common event X at that point in the action sequence. Nothing else
* will continue until the common event is finished (unless it is a forced
* action, in which case, it will wait until the action is complete first).
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* Usage Example: common event: 1