Android backend overhaul and fixes (roc-streaming#98)

Also fixes: roc-streaming#1, roc-streaming#16, roc-streaming#17, roc-streaming#66

- Initiate request for notification and microphone permissions
  and media projection on the dart side of AndroidBackend.

- Implement those requests in MainActivity.kt and rework
  AndroidConnector to redirect those requests to activity.

- Automatically stop media projection when both sender and receiver
  are stopped. Prevent service from stopping projection while we
  are starting sender and receiver.

- Implement synchronization and fix various races.

- Use foreground service instead of bound service, to keep it
  running when app closes.

- Forbid swiping away notification on lock screen.
  (We can forbid it only for lock screen).

- Stop sender and receiver when notification is swiped away.

- Add AndroidListener, to pass events from kotlin to dart.
  Implement in in AndroidBackend on dart side.

- Add AndroidSenderSettings, AndroidReceiverSettings, and pass them
  from model to kotlin.

- Hard-code ports in model instead of kotlin.

- Implement Backend.getLocalAddresses().

- Improve comments.

- Refactor android service code.

- Remove unused values from strings.xml.

android/app/build.gradle

@@ -44,7 +44,8 @@ android {
     defaultConfig {
         applicationId = "org.rocstreaming.rocdroid"
         // You can update the following values to match your application needs.
-        // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
+        // For more information, see:
+        // https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration
         minSdk = flutter.minSdkVersion
         targetSdk = flutter.targetSdkVersion
         versionCode = flutterVersionCode.toInteger()
@@ -65,6 +66,15 @@ android {
             signingConfig = signingConfigs.debug
         }
     }
+
+    // https://android.izzysoft.de/articles/named/iod-scan-apkchecks#blobs
+    // https://gist.github.com/obfusk/31c332b884464cd8aa06ce1ba1583c05
+    dependenciesInfo {
+        // Disables dependency metadata when building APKs.
+        includeInApk = false
+        // Disables dependency metadata when building Android App Bundles.
+        includeInBundle = false
+    }
 }
 
 flutter {
@@ -76,7 +86,7 @@ dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
     implementation 'androidx.appcompat:appcompat:1.1.0'
     implementation 'androidx.core:core-ktx:1.3.0'
-    implementation 'androidx.activity:activity-ktx:1.2.4'
+    implementation 'androidx.activity:activity-ktx:1.9.2'
     implementation 'androidx.fragment:fragment-ktx:1.3.6'
     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
     implementation 'com.google.android.material:material:1.3.0'

android/app/src/main/AndroidManifest.xml

@@ -1,17 +1,29 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="org.rocstreaming.rocdroid"
-    android:versionCode="2002"
-    android:versionName="0.2.2">
+    android:versionCode="3000"
+    android:versionName="0.3.0">
 
+    <!-- For sreaming -->
     <uses-permission android:name="android.permission.INTERNET" />
+    <!-- To get list of local network interfaces -->
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <!-- For sender, when capturing sound from microphone -->
     <uses-permission android:name="android.permission.RECORD_AUDIO" />
+    <!-- To continue working when app is closed -->
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <!-- For sender, when capturing sound from other apps -->
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MEDIA_PROJECTION" />
+    <!-- To create notification from sender -->
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/> 
 
     <application
         android:label="Roc Droid"
         android:name="${applicationName}"
         android:icon="@mipmap/launcher_icon">
+        <service
+            android:name=".StreamingService"
+            android:exported="false"
+            android:foregroundServiceType="mediaProjection" />
         <activity
             android:name=".MainActivity"
             android:exported="true"
@@ -43,7 +55,6 @@
     <!-- Required to query activities that can process text, see:
          https://developer.android.com/training/package-visibility and
          https://developer.android.com/reference/android/content/Intent#ACTION_PROCESS_TEXT.
-
          In particular, this is used by the Flutter engine in io.flutter.plugin.text.ProcessTextPlugin. -->
     <queries>
         <intent>