Only start Bluetooth in UI thread, WiFi needs background.

While we're at it, use `Thread`s rather than `AsyncTask`s because
they are more concise. Not 100% sure, but I think `AsyncTask`s
need to wait for the UI event loop to get to them in order kick off.

F-Droid/src/org/fdroid/fdroid/localrepo/type/BluetoothSwap.java

@@ -127,6 +127,14 @@ public class BluetoothSwap extends SwapType {
         }
     }
 
+    /**
+     * Don't try to start BT in the background. you can only start/stop a BT server once, else new connections don't work.
+     */
+    @Override
+    public void stopInBackground() {
+        stop();
+    }
+
     @Override
     public void stop() {
         if (server != null && server.isAlive()) {

F-Droid/src/org/fdroid/fdroid/localrepo/type/SwapType.java

@@ -72,15 +72,12 @@ public abstract class SwapType {
     }
 
     public void startInBackground() {
-        start();
+        new Thread() {
-        /**
-        new AsyncTask<Void, Void, Void>() {
             @Override
-            protected Void doInBackground(Void... params) {
+            public void run() {
-                start();
+                SwapType.this.start();
-                return null;
             }
-        }.execute();*/
+        }.start();
     }
 
     public void ensureRunning() {
@@ -90,23 +87,21 @@ public abstract class SwapType {
     }
 
     public void ensureRunningInBackground() {
-        new AsyncTask<Void, Void, Void>() {
+        new Thread() {
             @Override
-            protected Void doInBackground(Void... params) {
+            public void run() {
                 ensureRunning();
-                return null;
             }
-        }.execute();
+        }.start();
     }
 
     public void stopInBackground() {
-        new AsyncTask<Void, Void, Void>() {
+        new Thread() {
             @Override
-            protected Void doInBackground(Void... params) {
+            public void run() {
-                stop();
+                SwapType.this.stop();
-                return null;
             }
-        }.execute();
+        }.run();
     }
 
 }