Activating this trainer:

If not state otherwise below, press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.

Promo Options:

Resources: Smoke Bombs

Trainer Options:

NumPad1: Unlimited Health
NumPad2: Stealth Mode
NumPad3: Super Damage
NumPad4: No Reload
NumPad5: Unlimited Consumables and Items
NumPad6: Game Speed

Editor Options:

Resources: Money
Resources: Ammo
Resources: Poison Darts
Resources: Smoke Bombs

Notes:

Unlimited Health:
Toggle on and most things cannot kill you.  Falls and scripted deaths will kill you.

Stealth Mode:
Toggle on and most enemies that are not attacked will leave you alone.  Some items cannot be interacted with while this is on.  Some scripts or mission events require that this is off.

Super Damage:
Toggle on and many enemies are killed very quickly.  Probably best to leave this off in missions where you have friendlies that need to survive.

No Reload:
Toggle on and many weapons, notably pistols, can be fired over and over without reloading.

Unlimited Consumables and Items:
Toggle on and many items and consumables do not decline when used.

Game Speed:
Toggle on to speed up the game speed.