Remove new command.
Remove init-bundle command.
Remove dependency handling.
Remove unnecessary checks for package.sh.

Validate command already takes care of that.
Remove BIN entry from package.sh.

Binaries are found by convention inside a bin folder.
Add pacakge-path command.
Remove support for runtimes.
Remove completion support for now.
Remove requirement for a package.sh file.
Update TODO.
Automatically link any executable files in package root.