Address some build warnings

(cherry picked from commit 2d7650537db907a4129f4a07db15950339b319e9)

# Conflicts:
#	README.md
#	app/src/main/java/eu/kanade/presentation/category/components/CategoryDialogs.kt
#	source-api/src/commonMain/kotlin/eu/kanade/tachiyomi/source/model/SManga.kt

core/src/main/java/eu/kanade/tachiyomi/network/interceptor/SpecificHostRateLimitInterceptor.kt

@@ -51,6 +51,7 @@ fun OkHttpClient.Builder.rateLimitHost(
  * @param permits [Int]     Number of requests allowed within a period of units.
  * @param period [Duration] The limiting duration. Defaults to 1.seconds.
  */
+@Suppress("UNUSED")
 fun OkHttpClient.Builder.rateLimitHost(
     httpUrl: HttpUrl,
     permits: Int,
@@ -71,5 +72,6 @@ fun OkHttpClient.Builder.rateLimitHost(
  * @param permits [Int]     Number of requests allowed within a period of units.
  * @param period [Duration] The limiting duration. Defaults to 1.seconds.
  */
+@Suppress("UNUSED")
 fun OkHttpClient.Builder.rateLimitHost(url: String, permits: Int, period: Duration = 1.seconds) =
     addInterceptor(RateLimitInterceptor(url.toHttpUrlOrNull()?.host, permits, period))

core/src/main/java/tachiyomi/core/preference/InMemoryPreferenceStore.kt

@@ -51,6 +51,7 @@ class InMemoryPreferenceStore(
         TODO("Not yet implemented")
     }
 
+    @Suppress("UNCHECKED_CAST")
     override fun <T> getObject(
         key: String,
         defaultValue: T,
@@ -59,7 +60,7 @@ class InMemoryPreferenceStore(
     ): Preference<T> {
         val default = InMemoryPreference(key, null, defaultValue)
         val data: T? = preferences[key]?.get() as? T
-        return if (data == null) default else InMemoryPreference<T>(key, data, defaultValue)
+        return if (data == null) default else InMemoryPreference(key, data, defaultValue)
     }
 
     override fun getAll(): Map<String, *> {