Fixed Package condition testing which would fail, but also made it more
verbose.
Fixed shell-loading-snippets because of the rename to Setup-ScriptEnv.
Get-Path updated to support @ notation.
MyConfig class updated to resolve Paths before testing.
MyScript class will look recursivley - this might need to change again.
config.files.json updated to support shell-loading-snippets
shell-loading-snippets added, with single line of code to inject into
startup shell scripts (.zshrc, .bashrc, .shrc)