* Introducing a new Snippet type
* Adding a SnippetCollection and SnippetCollectionBuilder
* Using snippetCollection to get the snippets instead of fileService
* Fixed fetching the correct content
* Make ISnippet non-discoverable
* Split the SnippetCollection into PartialViewSnippetCollection and PartialViewMacroSnippetCollection
* Update CodeFileController to use the 2 snippet collections
* Display the names with Empty.cshtml on top
* Remove merging embedded snippets with custom snippets from ~\Umbraco.Web.UI\umbraco\PartialViewMacros\Templates folder for the Partial View Collection
* Fix naming
* Fix another naming
* Cleanup + Use base items
Co-authored-by: Bjarke Berg <mail@bergmania.dk>
