Using the `list` action with `-v` shows all current details for the
existing modules.
Don't try to install or update external modules, since they have an
absolute path instead of a valid URL.
and also simplify code by setting multiple variables at once. This
should make the resulting script a tiny bit smaller, while not
compromising on legibility.
and rename previous to git.
Tools allow for different install and update scripts. The git tool does
what the previous implementation did (installs and updates using the git
client). The new tool installs and updates with the GitHub API, not
using the git client, but using curl/wget and tar instead.
Closes#373
Eric Nielsen