add Simple Launchers settings as an icon

app/src/main/kotlin/com/simplemobiletools/launcher/activities/MainActivity.kt

@@ -364,6 +364,12 @@ class MainActivity : SimpleActivity(), FlingListener {
             allApps.add(AppLauncher(null, label, packageName, 0, placeholderColor, drawable))
         }
 
+        // add Simple Launchers settings as an app
+        val drawable = getDrawableForPackageName(packageName)
+        val placeholderColor = calculateAverageColor(drawable!!.toBitmap())
+        val launcherSettings = AppLauncher(null, getString(R.string.launcher_settings), packageName, 0, placeholderColor, drawable)
+        allApps.add(launcherSettings)
+
         val launchers = allApps.distinctBy { it.packageName } as ArrayList<AppLauncher>
         launchersDB.insertAll(launchers)
         return launchers

app/src/main/kotlin/com/simplemobiletools/launcher/extensions/Activity.kt

@@ -5,9 +5,16 @@ import android.content.Intent
 import android.net.Uri
 import android.provider.Settings
 import com.simplemobiletools.commons.extensions.showErrorToast
+import com.simplemobiletools.launcher.activities.SettingsActivity
 import com.simplemobiletools.launcher.helpers.UNINSTALL_APP_REQUEST_CODE
 
 fun Activity.launchApp(packageName: String) {
+    // if this is true, launch the app settings
+    if (packageName == this.packageName) {
+        startActivity(Intent(applicationContext, SettingsActivity::class.java))
+        return
+    }
+
     val launchIntent = packageManager.getLaunchIntentForPackage(packageName)
     try {
         startActivity(launchIntent)