RTQF Slerp power can be changed while fusion running

Changed RTQF to use quaternion slerp for fusion

Added support for MPU-6050 + HMC5883

Added support for the MS5611 pressure sensor and extended MPU-9150 dr…

…iver to support the MPU-6050

Python 3 now supported

Corrected MPU-9250 FIFO size

Added ability to set magnetic declination in .ini file.

Fixed problem with CmakeLists.txt for RTIMULibGL

Improved some CMakeLists. RTIMULib can now be built with cmake indepe…

…ndently

Improved RTHost CMakelists.txt