Check If/ElseIf/Else/EndIf + nesting

[NickNo-dev]

You can spend hours in finding falsely idented / written If clauses.
The builder could help a lot.

TODOs:

• Find "ElseIf" without condition -> Fatal Error (or correct to "ElseIf false")
• Find If / ElseIf / Else without EndIf
• Check+Correct identation of If / matching ElseIf / Else / EndIf

[Rizean]

I'm thinking my first pass at this will be check of the idents