main changes are:
- Modified marker (* character before name) goes up the project tree by
marking all parents of a modified object as modified.
- Impact management when changing an object's ID. Allows for some
refactoring to occur, while marking the impacted elements as modified,
or aven creating "altered" versions if imapcted element was only in game
source.
!! Also, "created" elements show the "unsaved" asterisk in their
description until they're saved to disk.
Added a button to the spritesheet editor to open image in an external
tool too. This may or may not remain in the app.
- Min/max values in various places were inverted
- Changed "increaseCurrentAP" to "increaseAttackDamage"
- Fixed wrong strings for the "reequip_cost" and the
"increase_attack_cost"
