POST endpoint for importing m3u playlists - #2078 (#2273)

* wip: API endpoint for creating playlists from m3u files

* wip: get user id from context

* temporarily disable failing test

* custom logic for playlist route to accomodate m3u content type

* incorporate playlist parsing into existing logic in core

* re-enable test

* fix locally failing test

* Address requested changes.

* Improve ImportFile tests.

* Remove ownerID as a parameter of ImportM3U.

* Write tests for ImportM3U.

* Separate ImportM3U test into two.

* Test OwnerID and playlist Name.

---------

Co-authored-by: Sam Watson <SwatsonCodes@users.noreply.github.com>
Co-authored-by: caiocotts <caio@cotts.com.br>

server/subsonic/responses/responses_test.go

@@ -625,7 +625,8 @@ var _ = Describe("Responses", func() {
 
 		Context("with data", func() {
 			BeforeEach(func() {
-				t, _ := time.Parse(time.RFC822, time.RFC822)
+				timeFmt := "2006-01-02 15:04:00"
+				t, _ := time.Parse(timeFmt, timeFmt)
 				response.ScanStatus = &ScanStatus{
 					Scanning:    true,
 					FolderCount: 123,