Applecrate

Added --identifier option

- Added `--identifier` option to specify package identifier
- Added `{{ machine }}` template variable for machine architecture (e.g. x86_64, arm64)

Added --chmod option

Added --chmod option to build command to change mode after installation.

A Few More Docs

Added a bit more documentation and tests.

Let's Play

This version should be ready to be played with by others. Please send feedback!

Package Signing

Added --sign option to sign the package with a Developer installer certificate

Render user files

User files such as pre-install scripts will now be rendered with Jinja.