Allow use of legacy perks

[Phil25]

Due to demand, perks which were changed in the 2.4.0 should be configurable to legacy version by server operators.

Checklist

• [x] PowerPlay Add legacy -- Use pre-2.4.0 PowerPlay (default 0)
• [x] Godmode Add fight_back -- Enemies can fight back (default 1)
• [x] Bat Swarm Add legacy -- Use pre-2.4.0 Bat Swarm (default 0)
• [x] Blind Add annotations -- Add annotations which follow enemies (default 1) Add unblind -- Briefly unblind on dealing damage (default 1)
• [x] Explode Setting time to -1 uses pre-2.4.0 Explode
• [x] Firework Add ignite -- Ignites player (default 1) Add damage -- Deal damage to player, -1 to explode (default 0) (#88)
• [x] Smite Setting time to -1 uses pre-2.4.0 Smite
• [x] Strip to Melee Setting time to -1 does not spawn cases.
• [x] Frozen Add legacy -- Use pre-2.4.0 Frozen (default 0)
• [x] Team Criticals Add mark_death -- Marks for death (default 1)

[Tiagoquix]

If you are going to reimplement the legacy Smite, I ask that you do it in the same way as the legacy Firework. The legacy Firework ignored godmode/buddha, while Smite did not.

This could also be applied to the current Necro Smash effect, since it remained the same as it was before the major update.

[Phil25]

All done