Work trying to improve layout on Android, and also allow app to accept other apps sending it files.

Added some code that tries to detect soft-keyboard showing and changing screen size, but I seem unable to move teh whole display up, or whatever, to keep input field visible.  Handling the layout with the WebView as the only part of the app seems to be causing some difficulties that are frusterating (I dont want WebView to resize, and I cant get the OS to handle things to keep input visible, like iOS does by default).

Resolve issue #34 (hopefully), by changing to allow InterSpec to accept any file type from another app.
Currently only handles accepting a single file. Only tested with Radiacode app and google drive.

Author: wcjohns

target/android/InterSpec/app/src/main/AndroidManifest.xml

@@ -8,7 +8,7 @@
     <!-- <uses-sdk android:minSdkVersion="12" android:targetSdkVersion="19"/> -->
     <supports-screens android:largeScreens="true" android:normalScreens="true" android:anyDensity="true" android:smallScreens="true"/>
     <application android:label="InterSpec"
-        android:theme="@style/Theme.AppCompat.NoActionBar"
+        android:theme="@style/AppTheme"
         android:usesCleartextTraffic="true"
         android:networkSecurityConfig="@xml/network_security_config">
         <!-- I added InterSpec/target/android/InterSpec/app/src/main/xml/network_security_config.xml,
@@ -37,13 +37,14 @@ ExecutorService myExecutor = Executors.newCachedThreadPool();
          -->
         <activity android:name="InterSpec"
             android:label="InterSpec"
+            android:theme="@style/AppTheme"
             android:icon="@mipmap/ic_launcher"
             android:roundIcon="@mipmap/ic_launcher_round"
             android:hardwareAccelerated="true"
             android:exported="true"
-            android:windowSoftInputMode="adjustResize|stateHidden"
-            android:configChanges="orientation|uiMode|screenLayout|screenSize|smallestScreenSize|locale|fontScale|keyboard|keyboardHidden|navigation"
-            android:screenOrientation="sensorLandscape"
+            android:windowSoftInputMode="adjustPan"
+            android:configChanges="keyboard|keyboardHidden|screenLayout|screenSize|orientation"
+            android:screenOrientation="unspecified"
             android:launchMode="singleTask">
 
             <intent-filter
@@ -156,6 +157,12 @@ ExecutorService myExecutor = Executors.newCachedThreadPool();
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
 
+            <intent-filter>
+                <action android:name="android.intent.action.SEND" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <data android:mimeType="*/*" />
+            </intent-filter>
+
             <!-- Splash screen -->
             <!--
             <meta-data android:name="android.app.splash_screen_drawable" android:resource="@drawable/logo"/>