Create "plugin" plugin

[oubiwann]

The command will look like this:

$ lfetool new plugin <name>

The "plugin" plugin will need to do the following:

• create a plugin dir in ~/.lfetool/plugins
• add a plugin behaviour module to ~/.lfetool/plugins/<name>/lfetool-plugin-<name>.lfe
• add a templates directory here: ~/.lfetool/plugins/<name>/templates
• add a script template here: ~/.lfetool/plugins/<name>/templates/XSCRIPT.tmpl

It doesn't need to do anything fancy with templates -- just one will be fine. In fact, the "script" plugin's template would be suitable.

The plugin directory layout would look like this:

./plugins/plugin/lfetool-plugin-plugin.lfe
./plugins/plugin/templates/XSCRIPT.tmpl
./plugins/plugin/templates/lfetool-plugin-PROJECT.lfe.tmpl

[oubiwann]

I could do a draft of this now, but I want to wait until all the other plugins have been migrated to see if the plugin behaviour needs to be updated first.