Viur-cli

- fix: `viur init` and `viur create` working again

- chore: fixes some typos

- fix: only ask for rebuild requirements if core is not submodule
- feat: added dependency hash and version check for core package

- chore: updated app_server to 0.9.0

- Updated get_pyodide.py for Pyodide v0.19.1
- Improved release module
- Only install pyodide when flare apps are configured
- Some verbose output improvements
- Some code refactoring
- conf.py holds the default Pyodide version
- Allows to run viur command from anywhere inside the project folder by resolving and chdir'ing backwards
- Improved error reporting and output (fatal error stops program execution)

- chore: updated app_server to 0.8.5