Fixed WFM demod
Fixed a segfault and/or infinite loop by re-organizing constructor instructions sequence. This fixes issue #88
Other fixes
- LimeSDR: fixed analog LP bandwidth filter and general calibration. According to LMS7002M Wiki: https://wiki.myriadrf.org/LMS7002Mr3_Calibration_Using_MCU the calibration was not done quite right. See details in issue #92. This version corrects this and is supposed to be done right
- ATV modulator: fixed text overlay size
Non functional changes
GUI and Rx/Tx channel core separation: modulator/demodulator constructor separated from the modulator.demodulator GUI constructor.