remove incarnation
monsters keep track of their abilities instead of querying the ability list and figuring out what they can use every time
display a message when spell wear off
allow abilities to modify stats
display effects with score
display cast message before effect message
update abilities command to show mana cost and command
cast spells via short command
implement spell stacking
* a spell has a stack_key -> default is the name of the spell
* the stack_count (default 1) determines how many spells with the same key may effect a monster at once

This means a spell can be made to stack n times, or several spells may share a stack key to ensure only
n total of that group are affecting a monster at once

If the stack_count for a stack_key is at maximum and another spell with that key is cast on a monster the
oldest active spell for that key will be removed. (players are free to re-cast spells to refresh the duration essentially)
don't persist monsters when they spawn
refactor ability macro
fix death of persisted monster and mana regen
add magic / attack damage to abilities
change mana formula, implement healing spells
spend spirit power to train monsters, reclaim it when the monster dies
fix hitting enter with no command
die at 0 hp, display cast message for effect-only spells
initiate combat when a damage spell is cast, don't initiate combat against yourself
monster __using__
misc tweaks