remove plus package from src folder

I merged the latest version from your master.
I made the following changes:
- Moved AndroidUtils and PlatformUtils to net.osmand.utils.
- Merged net.osmand.plus.access and net.osmand.plus.render to net.osmand.access and ..render.
- Renamed net.osmand.plus to net.osmand (only in src, not is use).
- Updated CpuCheck.cpp to reflect the changes.
- Resolved manifest issues (these are not related to the above changes)
   - android prefix was missing on path="go"
   - There was a MediaRemoteControlReceiver declared inside MapActivity. I removed this, it must have been a mistake. This receiver was declared again, but without CAMERA_BUTTON filter. I added this, I'm not sure if it's ok.
   - An issue I didn't solve: If you target KitKat (you should always target the latest version), you will see that WRITE_MEDIA_STORAGE permission is no longer available for normal apps. You can circumvent this by applying this:
http://forum.xda-developers.com/showthread.php?t=2634840

So this is for a start to see if everything is OK. I think OsmAnd will greatly benefit from the structural changes I make. Next I would like to move Activities and Plugins to their packages.