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/polishsource.yaml

@@ -5,7 +5,7 @@ identifier: polishsource
 description: PolishSource (PS) is a POLISH private torrent tracker for 0DAY / GENERAL.
 language: en-us
 urls:
-  - https://polishsource.cz
+  - https://polishsource.cz/
 privacy: private
 protocol: torrent
 supports:
@@ -54,22 +54,22 @@ irc:
       label: Invite command
       help: Invite auth with PS-Info. Replace IRCKEY with your IRC key.
 
+  parse:
+    type: single
+    lines:
+      - test:
+          - "Some.Show.S09E01.HDTV.x264-GROUP > TV/SD > 359.285 MB / 2 F > [ http://polishsource.cz/details.php?id=000000 ]-[ 5h 25min 15sec after pre ]"
+          - "Some.Movie.2011.DVDRip.x264-GROUP2 > Movies/x264 (Documentary) > 563.296 MB / 2 F > [ http://polishsource.cz/details.php?id=000000 ]-[ 2min 48sec after pre ]"
+        pattern: '(.*) > (.*) > (.*) \/.*>\s*\[ (https?\:\/\/.+\/).*[&?]id=(\d+)\s\](?:-\[ (.*) \])?'
+        vars:
+          - torrentName
+          - category
+          - torrentSize
+          - baseUrl
+          - torrentId
+          - preTime
 
-parse:
-  type: single
-  lines:
-    - test:
-        - "Some.Show.S09E01.HDTV.x264-GROUP > TV/SD > 359.285 MB / 2 F > [ http://polishsource.cz/details.php?id=000000 ]-[ 5h 25min 15sec after pre ]"
-        - "Some.Movie.2011.DVDRip.x264-GROUP2 > Movies/x264 (Documentary) > 563.296 MB / 2 F > [ http://polishsource.cz/details.php?id=000000 ]-[ 2min 48sec after pre ]"
-      pattern: '(.*)\s>\s(.*)\s>\s(.*) \/.*>\s*\[ https?\:\/\/([^\/]+)\/.*[&?]id=(\d+)\s\](?:-\[ (.*) \])?'
-      vars:
+    match:
+      torrenturl: "/downloadssl.php?id={{ .torrentId }}&torr={{ .torrentName }}.torrent&passkey={{ .passkey }}"
+      encode:
         - torrentName
-        - category
-        - torrentSize
-        - baseUrl
-        - torrentId
-
-  match:
-    torrenturl: "https://{{ .baseUrl }}/downloadssl.php?id={{ .torrentId }}&torr={{ .torrentName }}.torrent&passkey={{ .passkey }}"
-    encode:
-      - torrentName