Consolidate user settings into a dictionary

[ralish]

The module permits several settings to be set globally via PowerShell variables. The currently supported variables can be found in Profile.sample.ps1. It'd be nice to move these into a single dictionary type. For example:

$PSDotFilesSettings = @{
    # Dotfiles directory path
    Path                      = (Join-Path -Path $HOME -ChildPath 'dotfiles')
    # Enable automatic detection of components
    Autodetect                = $true
    # Enable handling of intermediate destination symlinks
    AllowNestedSymlinks       = $true
    # Skip validation of metadata XML files against XSD schema
    SkipMetadataSchemaChecks  = $false
}