1.0.0-rc.1

Release 1.0.0-rc.1

- Add shortcuts for menu items
- Preserve window size between runs
- Drop win32 support
- Add win64 support
- Add remesh by integrating Instant-Meshes
- Add cloth simulation by integrating FastMassSpring
- New rig generator
- Add Spanish and Italian language
- Fix glb exporting alpha mode setting
- Add texture size preference setting
- Add example model: Cat