Executer, refactor to not parse when SAY

[theludovyc]

Currently in SAY (in Executer), we have var sub_results = regex_cache["VARIABLE_IN_STR"].search_all(text)

So we need to have regex things in Executer. It is bad, because Executer should just execute, not parse. Plus we have code duplication between Parser and Executer. And like for #93 , to fix bug, we need to update both Parser and Executer on same things.

To avoid this, we need to refactor Executer.

[Jeremi360]

@theludovyc This is a very good idea to don't have any duplication.
Duplication is that what made Blender Game Engine dead.

[theludovyc]

Blender Game Engine, first game engine I use, long time ago...