improve C_Trigger usage example

[the-overdriven]

The current example is incomplete and not working in game.

I've copy-pasted an extended working example from GMC discord by @auronen.

Added a few minor improvements:

• fixed trigger variable names (use trigger only, not trigger and SelfTrigger)
• removed delay acceleration (for the sake of basic example it was adding unnecessary complexity and can cause "Divide by Zero" error if delay drops below 0)
• renamed ambiguous c_loop to poison_me_loop

[kamilkrzyskow]

Thanks for the contribution. hmm, you're defining the class yourself in Daedalus.

I recalled a similar comment on Discord here where Gratt mentioned the After option:

META {
  After = zUnionTrigger.d; // include triggers api
  Using = zParserExtender; // using std namespace
};

However, idk if zUnionTrigger.d is part of Union or not maybe it needs to be defined by the user with the snippet above 🤔 Was this case also considered? I saw Gratt commenting in "more recent" threads, but it was never mentioned again, so it could be patched out 🤔