Overhaul tracking issue

[sneurlax]

As part of the ongoing flutter_libepiccash rewrite, these issues should be resolved:

• Use official sources #15
• Integrate irondash/cargokit for build #57
• Dart bindings generation #62
• Rust error handling #48
• Dart error handling #38

Optional / attempt reproduction and fix:

• Fix Android NDK version #42
• Crashes when opening wallet on macOS #49

Then:

• Implement emoji encoding #59

Finally, make sure to address any changes from #8 that also apply to these incoming changes.