Changes!

• Added a sidebar that focuses on & can open character sheets which lists everything a unit has
• You now pick 3 mechs for your squad before the fight starts (not remotely balanced)
• Added context-specific buffs; Duelist I accuracy, Momentum bonus damage
• Can self-destruct
• Added invisibility & 50% miss chance
• Added text fx on adding/removing statuses & using abilities.
  • it might be too chatty; I might skip showing stuff like "Engaged!"
• Added Nelson & Kobold frames & their respective frame traits
  • Hacky Main/Aux implementation; war pike is just treated like an aux
  • Mimic carapace still doesn't know that lock on isn't an attack

Bugfixes

• Prevent rxns from triggering on the same event twice; fixes inability to cancel overwatch
• Stopped 1/loop turret death on swallowtail death
• Hidden no longer lost on engagement; AI units will search instead
• Fix cancelling frag grenade
• Puppet system no longer softlocks when used on prone enemy