Refactor Logger and add Settings-UI

- Refactored logger infrastructure, so that sensors have to provide
proper timestamps for the logged data, instead of the Logger generating
a timestamp when it is logged to the file.
- Added a settings UI where active sensors and activities can be
configured

app/src/main/AndroidManifest.xml

@@ -1,10 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="de.fhws.indoor.sensorreadout">
-    >
-
     <!-- <uses-feature android:name="android.hardware.type.watch" /> -->
-
     <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
     <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
     <uses-permission android:name="android.permission.BLUETOOTH" />
@@ -13,8 +10,7 @@
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
     <uses-permission android:name="android.permission.WAKE_LOCK" />
     <uses-permission android:name="android.permission.BODY_SENSORS" />
-    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
-    <!-- Needed only if your app targets Android 5.0 (API level 21) or higher. -->
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> <!-- Needed only if your app targets Android 5.0 (API level 21) or higher. -->
     <uses-feature android:name="android.hardware.location.gps" />
 
     <uses-permission-sdk-23 android:name="android.permission.ACCESS_FINE_LOCATION" />
@@ -24,6 +20,8 @@
         android:icon="@drawable/icon"
         android:label="@string/app_name"
         android:theme="@style/AppTheme">
+        <activity android:name=".SettingsActivity"></activity>
+
         <uses-library
             android:name="com.google.android.wearable"
             android:required="false" />