Create a command line utility that enhances the creation, packaging, and updating of apps

[kkoreilly]

Currently, there is a lot of boilerplate code involved in each new project (mainrun, window, viewport, main menu, window event loop, etc). This could be simplified with a goki new command. Also, it is currently difficult to package apps with icons and information for different platforms (.msi on Windows, .app on MacOS, .deb on Linux, etc). This could be simplified with a goki package command. Furthermore, there is currently no easy way to manage the versions of apps outside of the Go ecosystem.