fix: Log not showing in CLI (ReVanced#80)

* Fix ReVanced#79. Changed from default StreamHandler to FlushingStreamHandler which flushes after every log statement

* Added removal of handlers, so they will not be duplicated.

* Replaced removal of handlers with addition only in case if there are no handlers already.
Changed errorLogger name from hardcoded to reusing previous logger name, so it will have the same name if only first parameter is used.

* Replaced calls ::javaClass.name to ::class.java.name to have proper class names in loggers

src/main/kotlin/app/revanced/cli/logging/impl/DefaultCliLogger.kt

@@ -4,17 +4,19 @@ import app.revanced.cli.command.MainCommand
 import app.revanced.cli.logging.CliLogger
 import java.util.logging.Logger
 import java.util.logging.SimpleFormatter
-import java.util.logging.StreamHandler
 
 internal class DefaultCliLogger(
-    private val logger: Logger = Logger.getLogger(MainCommand::javaClass.name),
-    private val errorLogger: Logger = Logger.getLogger(MainCommand::javaClass.name + "Err")
+    private val logger: Logger = Logger.getLogger(MainCommand::class.java.name),
+    private val errorLogger: Logger = Logger.getLogger(logger.name + "Err")
 ) : CliLogger {
 
     init {
         logger.useParentHandlers = false
-        logger.addHandler(StreamHandler(System.out, SimpleFormatter()))
+        if (logger.handlers.isEmpty()) {
+            logger.addHandler(FlushingStreamHandler(System.out, SimpleFormatter()))
+        }
     }
+
     companion object {
         init {
             System.setProperty("java.util.logging.SimpleFormatter.format", "%4\$s: %5\$s %n")

src/main/kotlin/app/revanced/cli/logging/impl/FlushingStreamHandler.kt

@@ -0,0 +1,13 @@
+package app.revanced.cli.logging.impl
+
+import java.io.OutputStream
+import java.util.logging.Formatter
+import java.util.logging.LogRecord
+import java.util.logging.StreamHandler
+
+internal class FlushingStreamHandler(out: OutputStream, format: Formatter) : StreamHandler(out, format) {
+    override fun publish(record: LogRecord) {
+        super.publish(record)
+        flush()
+    }
+}

src/main/kotlin/app/revanced/cli/patcher/logging/impl/PatcherLogger.kt

@@ -4,7 +4,7 @@ import app.revanced.cli.logging.impl.DefaultCliLogger
 import java.util.logging.Logger
 
 internal object PatcherLogger : app.revanced.patcher.logging.Logger{
-    private val logger = DefaultCliLogger(Logger.getLogger(app.revanced.patcher.Patcher::javaClass.name))
+    private val logger = DefaultCliLogger(Logger.getLogger(app.revanced.patcher.Patcher::class.java.name))
 
     override fun error(msg: String) = logger.error(msg)
     override fun info(msg: String) = logger.info(msg)