* refactor meshing and trait API to replace guillotiere types
* associated config type on atlas trait
* investigate other areas of sprite performance like LOD scaling (i.e.
there are now significant gaps in between meshing)
- `BlockFloater`s and `ComboFloater`s don't store the owner anymore,
`ExpFloater` still does, however the field is used to prevent
accumulating old floaters with new ones. This change also makes it so
that if the client changes entity, they keep the old entity's
floaters.
- The `combo_floaters` field is now `combo_floater` plus it now uses an
Option<ExpFloater>.
- Changed `handle_health_change` to change the health even if the entity
does not have a `Pos` or `Uid`, now uses `emit_now`combo_floater` plus
it now uses an Option<ExpFloater>.
- Changed `handle_health_change` to change the health even if the entity
does not have a `Pos` or `Uid`, now uses `emit_now`
- Changed some comments
- Change hp_pulse to not be framerate dependent
- Change some of the HpFloater checks to be inside the find() function
- Remove unnecessary join
- Add back option for showing incoming damage + add option for
experience accumulation
- Change `ExpFloater`s to not store the owner, as they are only shown
for the player (will have to see if the implementation is correct so
that it may be applied to the other floaters)
- Rename `Outcome::Damage` to `Outcome::HealthChange` and `DamageInfo`
to `HealthChangeInfo`
- Update some outdated comments/documentation
* Old display_shortened that returned Option is now called try_shortened
* What was called try_shortened is now just display_shortest, because if
shortened version isn't available, it means that regular version is
already shortened.
* Make try_shortened method that tries shortened version of key or
regular version if shortened one isn't available
* Use it in most places where display_shortened + display_string were
used
* Use it for diary skilbar
