Hiding, mines, crits

Behold, the fruits of a full week of work on this project!

• Swallowtail can throw grenades.
• Swallowtail can place mines that arm end-of-turn and explode on a unit walking by.
• Hide and search actions working! Can only hide when out of direct LOS or in some kind of cover. Searching becomes available if there's a hidden unit nearby.
• Overheating 1-stress enemies applies Exposed.
• Units without heat caps (such as turrets) take heat as normal damage.
• Implemented critical hits, including effects that can just trigger on crits e.g. the chain axe applying Shredded.
• Weapons with special tags e.g. arcing have a little ribbon that you can hover and see what it does.
• If you get Stunned on your turn, you lose the rest of your actions.
• Dialogue blip sfx as text pops in, continue to next line.
• Intra-scene jukebox so sfx can seamlessly start in one and continue in another.
• Added effects from DreamyPixelArt: stabilize, structured, stressed, overcharge, start turn, reactor meltdown, mine, grenade.