C/C++ functions fully operational

All the Omega Edit functions are fully operational and have been successfully tested.

What's Changed

• add session change callback and viewport capacity limit by @scholarsmate in #12
• implement session edit model by @scholarsmate in #15
• vignettes by @scholarsmate in #16
• add rotate application to tests by @scholarsmate in #17

Full Changelog: v0.1.1...v0.5.0