MCU 1.35 / 10/12/2015
* Added USB keyboard support (see PX3_Keyboard_QuickStart.pdf for usage), most keyboards are supported except Bluetooth, Apple and those with mice.
* Added separate font for Text Decode, which can be different than system font.
* Three lines of RX text, 2 lines of TX text.
* Added 7x11 font which was introduced on the P3
* Added serial commands #USB, #BCN,#BCI, #BCL, #TXM, #TXH to support keyboard.
* Added ability CR and LF in text messages ‘\r’ for CR, ‘\n’ for LF
* Fixes wrong direction spectrum when VFO A is tuned on 2 meters.
* Fixes default values for USB keyboard values when upgrading.
* Fixes ‘smearing’ U-shaped VFO A cursor when fixed tune is enabled.
* Fixes bug with some older units that could have prevented USB from operating.
* Fixes Ctrl-Alt-R keyboard replay, removes garbage characters.
* Fixes missing characters entered with key when no keyboard attached.
* Fixes a problem with RefLvl being too high after upgrading firmware.
* Fixes an issue with display freezing when RIT/XIT was adjusted on KX3
* Fixes displayed frequency not updating when RIT was turned off.
* Limits waterfall size when text display is active, so menus are displayed correctly.
* OSB amplitude and phase serial commands added.
