Summon Spells Rework

My goal here is to improve summon durations without making them op while directly changing spell effect costs so that custom spells are equal alternatives.

SummonSpellRework.esp

- Changed all summon spells to be 60s duration and spell effect costs to match appropriate skill levels

- Some Power/Lesser Powers have considerably higher durations, 600/240s

- I did not touch the individual summoned creatures, some other mods can do a better job than me

- Summon limit increased to 99, only 1 of each summon can still exist at a time

I made this mod for myself and uploaded it for anyone to try out. I tried to touch as few things as possible to avoid conflict with other mods.