CraftUI

This is a minor update with numerous internal fixes. There's only one developer-facing change, that being an update to the json schema used to define styles. That's the only reason this isn't just a patch version; there have been no API changes.

Changes:

• Fixed an issue where the mouse would get improperly locked in a dockspace app if the viewport wasn't visble
• Updated the default style to be more readable
• Changed the style schema to make a bit more sense
• If an app throws an exception, it no longer crashes ImGui along with it, allowing Minecraft to write a proper crash log. (Note that it's still possible to crash ImGui; it just happens less often.)
• Fixed an issue in 1.21.4 where the mouse would appear in the wrong place when unlocked in a dockspace app
• Created an extremely barebones icon to replace the generated one

Full Changelog: https://github.com/Igrium/CraftUI/compare/0.3.0...0.4.0