Extend / Improve Trigger functionality

[Niek]

With my recent work on Triggerscripting, it appears to me that the Trigger workflow (includes Triggerhelper.js) could use some additional functionality to ease scripting.

This includes (but is not limited to): Pre-written functions for:

• Adding resources to players.
• Pushing GUI notifications.

Enhancing:

• GUI dialog to allow for distinguishing multiple windows (possibly by allowing to set a button id to which can by checked against in the trigger code).
• allowing for AI's and Triggerscripts to communicate with each other (not necessarily the AI code itself, but the ability to do so)

This list is not quite complete and more additions to the list would be appreciated.