Implement Maniacs Battle Common Events (Second Try)

[Ghabry]

See #3307 with the difference that it hooks directly into our Game_CommonEvent class to make the parallel events execute as intended.

Imo this is closer than #3307 but still not perfect, especially when the Parallel events show messages. When no messages are shown it appears to be... okay (?)

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I need testers for this! I don't really know of alot of games that use this Battle stuff and are not 100 million lines of event voodoo. So this is hard to test.

Your task: Throw this Player PR at games that use this feature and even better figure out where it fails in the event code.

When I don't get enough useful reports this PR will never be merged as I won't integrate untested code into the Player. Thank you for your attention.

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Also noticed a bug in the Get ATB function: It must return the percentage

[jetrotal]

I wonder if gobble fantasy uses it:

https://dogs-understand.itch.io/gobble-fantasy-2003

From what I read, it uses maniacs to force atb to work as a turn based battle

[Ghabry]

Nope:

> grep trigger RPG_RT.edb | sort | uniq -c
      4     <trigger>3</trigger>
     53     <trigger>4</trigger>
    217     <trigger>5</trigger>

Start is 6, Battle Parallel is 7

[korean-guy]

When I simply tested it, it seems to behave the same as #3307 .
I haven't checked it in #3307 , but I tested the ATB gauge in this PR.
If member[1].gauge is output as a variable value, it is output as a percentage,
When the ATB value is obtained from the Control Battle command, it is output as a numerical value, not as a percentage.
I don't know if this was meant to be.