[#1496] Image conversion (#1505)

* [#1496] First conversion attempt

* [#1496] Configurable conversion

* Fix: allow nested configs (map)

* [#1496] Support explicit `none` conversion

* Use MimeUtils for provided download

* [1496] Support image conversion on load for downloaded images

* Lint

* [#1496] Support conversion on fresh download as well

Previous commit was only for already downloaded images, now also for
fresh and cached

* [#1496] Refactor: Move where conversion for download happens

* Rewrite config handling, improve custom types

* Lint

* Add format to pages mutation

* Lint

* Standardize url encode

* Lint

* Config: Allow additional conversion parameters

* Implement conversion quality parameter

* Lint

* Implement a conversion util to allow fallback readers

* Add downloadConversions to api and backup, fix updateValue issues

* Lint

* Minor cleanup

* Update libs.versions.toml

---------

Co-authored-by: Syer10 <syer10@users.noreply.github.com>

server/src/main/kotlin/suwayomi/tachidesk/opds/util/OpdsStringUtil.kt

@@ -2,7 +2,6 @@ package suwayomi.tachidesk.opds.util
 
 import suwayomi.tachidesk.server.serverConfig
 import java.net.URLEncoder
-import java.nio.charset.StandardCharsets
 import java.text.Normalizer
 
 /**
@@ -15,7 +14,7 @@ object OpdsStringUtil {
      * Encodes a string to be used in OPDS URLs.
      * @return The URL-encoded string
      */
-    fun String.encodeForOpdsURL(): String = URLEncoder.encode(this, StandardCharsets.UTF_8.toString())
+    fun String.encodeForOpdsURL(): String = URLEncoder.encode(this, Charsets.UTF_8)
 
     /**
      * Converts a string into a URL-friendly slug.