Modify extension bytecode to fix SimpleDateFormat cannot parse errors (#149)

- Fixes sources like NHentai
- Fixes mass testing
- Cleans up a bit of the build.gradle.kts's
- Fix Tsuki by setting a http.agent system property

build.gradle.kts

@@ -43,7 +43,7 @@ configure(projects) {
         // Kotlin
         implementation(kotlin("stdlib-jdk8"))
         implementation(kotlin("reflect"))
-        testImplementation(kotlin("test"))
+        testImplementation(kotlin("test-junit5"))
 
         // coroutines
         val coroutinesVersion = "1.4.3"