Using -ListAvailable with Get-Command to ensure no module loading is
attampeted while querying loaded commands.
This improved performance when certain modules have not been
loaded yet
This all started because I wanted the UnixCompleters module and
initialization to move to the base.linux package.
* MyConfig.class modified to load from all modules
* Test-MyModules suppress empty entries
* removed unix entries from base/src/modules.json
+ created base.linux/src/modules.json