feat(indexers): add support for optional baseurl override (#551)

* feat(indexers): optional baseurl override

* feat(indexers): update baseUrl parsing

* refactor(indexers): BREAKING move parse to IRC struct

* Move Parse as part of IRC struct from Indexer
* Updated definitions
* Build torrentUrl in stages
* Use new url.JoinPath to build torrentUrl
* Update tests

* refactor(indexers): select option obj

* refactor(indexers): make backwards compatible

internal/indexer/definitions/retroflix.yaml

@@ -5,7 +5,7 @@ identifier: retroflix
 description: RetroFlix (RFX) is a private torrent tracker for CLASSIC MOVIES / TV / GENERAL
 language: en-us
 urls:
-  - https://retroflix.club
+  - https://retroflix.club/
 privacy: private
 protocol: torrent
 supports:
@@ -50,21 +50,21 @@ irc:
       label: NickServ Password
       help: NickServ password
 
-parse:
-  type: single
-  lines:
-    - test:
-        - "New! (Movies) - [REQUESTED].French.Movie.(1978).(French.with.English.Subtitles) - (18.76 GB) - https://retroflix.club/browse/t/00000/french-movie-1978-french-with-english-subtitles"
-        - "New! (Movies) - Old.Movie.1967.1080p.BluRay.x265.10bit-GROUP1 - (5.42 GB) - https://retroflix.club/browse/t/00000/old-movie-1967-1080p-bluray-x265-10bit-group1"
-      pattern: ^New! \((.*)\) - (.*) - \((.*)\) - (https?:\/\/.*\/)browse/t/(\d+).*
-      vars:
-        - category
-        - torrentName
-        - torrentSize
-        - baseUrl
-        - torrentId
+  parse:
+    type: single
+    lines:
+      - test:
+          - "New! (Movies) - [REQUESTED].French.Movie.(1978).(French.with.English.Subtitles) - (18.76 GB) - https://retroflix.club/browse/t/00000/french-movie-1978-french-with-english-subtitles"
+          - "New! (Movies) - Old.Movie.1967.1080p.BluRay.x265.10bit-GROUP1 - (5.42 GB) - https://retroflix.club/browse/t/00000/old-movie-1967-1080p-bluray-x265-10bit-group1"
+        pattern: ^New! \((.*)\) - (.*) - \((.*)\) - (https?:\/\/.*\/)browse/t/(\d+).*
+        vars:
+          - category
+          - torrentName
+          - torrentSize
+          - baseUrl
+          - torrentId
 
-  match:
-    torrenturl: "{{ .baseUrl }}download.php?id={{ .torrentId }}&passkey={{ .passkey }}"
-    encode:
-      - torrentName
+    match:
+      torrenturl: "/download.php?id={{ .torrentId }}&passkey={{ .passkey }}"
+      encode:
+        - torrentName