This only affects the build when using Qt 5.5.1. Other versions are unchanged.
So far only tested with Mac OS.

- Delete all old map code

Still not working right...

Restructured to better fit existing build structure

Fixing case error in include file.
Adding missing header for Linux.

Added Bing Hybrid Map
Added Open Street Map
Set map selection menu checks (exclusive check)
Handle proper image type otherwise disk caching fails

As this is no longer google specific, renamed everything google to qgc.

Although the method is marked as thread safe in the docs, if you use a
database plugin it ends up not being thread safe.

Operator = is not thread-safe, but copy constructor looks to be. This
is causing an intermittent crash.

QSerialPort buffering too slow on Windows.