Additions:

• Added 'Change sprite' action to be able to change a battler's sprite during an action sequence

Change sprite:battlerEntity,identifier
- Replace 'identifier' with any string. This has the same effect as defining the <battlerid> meta tag for an actor/enemy. </battlerid>

• Added 'Start common event' action to be able to run a common event during an action sequence

Start common event:commonEventId,shouldWait
- Replace 'commonEventId' with the id of a common event
- Replace 'shouldWait' with 'wait' or 'nowait', whether to wait or not for the common event to finish before
proceeding to the next action

• Added two new meta tags for enemies to offset enemy state icons: <stateIconOffsetX> & <stateIconOffsetY>