New Command: 99999 - Barebones Scripting Language

[jetrotal]

TPC commands for testing purposes:

@raw 99999, "@10110(""test"",[1 ,2, 3,4 ,5,6],0) //show dialog" 
@raw 99999, "@10310 ("""",[0 ,0, 100],0) //add 100 money" 
@raw 99999, "@10110(""@10110(\""test\"",[1 ,2, 3,4 ,5,6],0)"",[1 ,2, 3,4 ,5,6],0) //a collection of problematic syntax just to test how it deals with it"

Work in progress. I need a lot of help with this one.

It injects commands from 99999's com.string.

I can't parse proper syntax, since it isn't mapped anywhere.
But it can be useful alongside stringvars to load commands from txt files.

[fdelapena]

Looks promising, just some observations:

• Because regex has portability issues, maybe is worth to replace it with some str functions.
• Is 99999 used by an existing command? Otherwise maybe is better to use the maximum "reserved" value from easyrpg command IDs.

[jetrotal]

Not needed anymore, #3137 covers and improves this idea.