New Spell Effect: Rage with its Keeper Power

[walt253]

Introduces a new Spell Effect: Rage.

“Makes the creature attack recklessly, hitting harder and faster without dodging.”

Multiply strength of user by 1.5, its speed by 2, halves cooldown of abilities by 2, set its defense stat to 0. The speed bonus and cooldown reduction STACK with speed, this is intended! This means a creature under Speed and Rage can deal a lot more damage than usual.

Bundled with a Keeper Power that apply Rage effect on the target.

[walt253]

I also made minors changes regarding comments on creature.cfg and magic.cfg.

[walt253]

mh those conflicts are not easy 🤔

you may want to cherry pick stuff from this commit: a7a4792861a9e747d10dbad9c35aa24efa971ea3

I'm thinking to close this PR, since https://github.com/dkfans/keeperfx/pull/3212 is a good step towards more configurable keeper power and ultimately instead of hardcoding more stuff might be best to do something different for this rage buff. 🤔

Up to you!