Performance improvements and UI enhancements

This update includes various performance improvements and enhancements to the user interface.

Changes

• A lot of improvements and fixes under the hood.
• Color picker is now about 2x faster.
• We reworked the UI logic, so it is more efficient/performant.
• Now you can nudge pixel by pixel by using Arrows, or every 10px using CMD + Arrows.
• A lot of improvements when editing multiple objects' materials.
• New tutorial descriptions when starting the app for the first time. (New temp bugs introduced while we are refactoring).