Feature/streamline settings (#1614)

* Cleanup graphql setting mutation

* Validate values read from config

* Generate server-reference.conf files from ServerConfig

* Remove unnecessary enum value handling in config value update

Commit df0078b725 introduced the usage of config4k, which handles enums automatically. Thus, this handling is outdated and not needed anymore

* Generate gql SettingsType from ServerConfig

* Extract settings backup logic

* Generate settings backup files

* Move "group" arg to second position

To make it easier to detect and have it at the same position consistently for all settings.

* Remove setting generation from compilation

* Extract setting generation code into new module

* Extract pure setting generation code into new module

* Remove generated settings files from src tree

* Force each setting to set a default value

server/src/main/kotlin/suwayomi/tachidesk/opds/impl/OpdsFeedBuilder.kt

@@ -597,7 +597,7 @@ object OpdsFeedBuilder {
                 "desc", "number_desc" -> ChapterTable.sourceOrder to SortOrder.DESC
                 "date_asc" -> ChapterTable.date_upload to SortOrder.ASC
                 "date_desc" -> ChapterTable.date_upload to SortOrder.DESC
-                else -> ChapterTable.sourceOrder to (serverConfig.opdsChapterSortOrder.value ?: SortOrder.ASC)
+                else -> ChapterTable.sourceOrder to (serverConfig.opdsChapterSortOrder.value)
             }
         val currentFilter = filterParam?.lowercase() ?: if (serverConfig.opdsShowOnlyUnreadChapters.value) "unread" else "all"
         var (chapterEntries, totalChapters) =