Fix Build Breakage of Antenna Track Plugin with QT 5

The Antenna Track Plugin has not been maintained for a long time, and it won't compile with QT 5. This fix will eliminate the build errors.
Changes:
1. Fix dependencies of the Antenna Track plugin.
2. Replace QextSerialPort libraries with QT 5 built-in serial port libraries.
3. Use new macros to register this plugin.
4. Enable the plugin by default.

Reported-by: Ye Wang wangyeee@gmail.com
Is the json file already there? Don't see it on this changeset maybe it was already created.