Release 4

Note to TAs

Zach and Tian pair programmed.

What's Changed

• Organized presets into folders based on their type by @harrisonheld in #18
• Mesh exporting by @harrisonheld in #19
• Bugfixes by @harrisonheld in #20
• Polish gui zach by @harrisonheld in #21

Full Changelog: v1.2.0...v1.3.0