Develop

[mattwright324]

Initially reverted back to 2015 code to go back to Gradle and Swing

• Why did I remove gradle in 2017? I was stupid and didn't understand the benefits of using it
• As much as I like JavaFX, its too much of a hassle to use and distribute apps with it after being split out of the JDK

Enhancements and updates

• Update Gradle to the latest 8.x
• Rename, refactor, and fix a lot of stuff
• Add and use Flatlaf Swing UI library. Embedded menu items are really nice
• Add greenrobot event system and start using events for many actions (and de-static a ton of things)
• Add log4j2 to add some debug logging
• Modify drawing the cursor circle to be based off grid cells
• Refactor particle frame update processing to prevent interactions from sweeping across all connected parts in a frame instead of just the local area it should've happened in
• Add a few new elements and tools
  • BOMB explodes on contact with other elements removing almost everything in a circle around it
  • BTRY constant source of SPRK
  • COOL reduces temperature of parts within cursor
  • WARM increases temperature of parts within cursor