Design API for "complex" event commands

[Ghabry]

From an editor point of view there are two types of event commands:

Basic event commands: The event only operates on there data (Currently the API only supports this)

There are two types of complex commands:

E.g. Message Command & Comment

• The commands following the main command are lines belonging to it

E.g. Branches

• They can add/delete if/else branches directly after the command

[Ghabry]

Main problem here is that the widget that shows the EventCommands is very fragile.
It takes pointers to event commands for each item in the tree. So a complex manipulation will have many dangling pointers and crash sooner or later.
So before solving this the Event command widget must be refactored.