HTELE: first version of HoTT Telemetry for FF3 and Quanton

add a 2k resistor to used usart port between rx and. connect rx
directly to telemetry pin.
bugfix GPS speed. adjust protocol timing
use more accuarte timing method. add sample text to vario sensor
bugfix when reading uninitialized UAVOs.
fixes a little bug in min/max altitude calculation
correct ESC message structure and fill it with some data
add first version for homeposition and direction

direction calculation may be wrong, but it distance is ok.
correct scale factor for flight battery. gps altitude now relative to home
bugfix in gps calculation, changes to flighttime usage

fix gps degree and home course calulation. use estimated flighttime as
time value.
bugfix battery calculation. use fabs() instead of abs()
changes to VARIO and GPS

VARIO is now relative to ground. arming resets min/max values
GPS and Homelocation state ist now displayed
more information in textline.
different display for uninitialized and 'no error' display on GPS
add most warning messages. telemetrie speaks now.

restructure code to save memory when unused. add telemetrie warnings
for beeps and spoken messages. limits are available via uavo.
messages can switched on/off.
statusline is now in nonstatic (allocated) memory
add gps attitude and time values. add inverse telegram bits
use type 'uword_t' for structures. clean up structures code and comments.
changed float to int16 in settings to save settings memory.
little changes to comment texts
climbrate calculation with ring buffer. move some global variables to allocated mem.
HTELE: add support for freedom,revolution,revomini and sparky