New LightTelemetry module.
This is a simple & lightweight one way telemetry protocol.
It's intended to be used for air to ground long range telemetry, can fit in 1200 bauds.
For now It's dedicated to Ghettostation antenna tracker. It will be extended in the future for ground OSD usage with additional frames.

LTM is for now one 18 bytes frames refreshed at 5hz ( 900bauds ).
LTM: added missing #define.
Merge branch 'next' into LTM
Merge branch 'next' into LTM
LTM: fix coptercontrol
     forgot LTM define for all boards but revomini.
LTM: fix compile for ff3 ff4 freedom quanton
fix define
* LTM: Update LightTelemetry protocol to version 2.

It knows use 3 different frames at the selected rates:

Baudrate  1200 | 2400 & more
GPS       2Hz  |  5Hz
Attitude  5Hz  | 10Hz
Sensors   2Hz  |  5Hz

 G Frame (GPS position) (2hz @ 1200 bauds , 5hz >= 2400 bauds): 18BYTES
 0x24 0x54 0x47 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF  0xFF   0xC0
  $     T    G  --------LAT-------- -------LON---------  SPD --------ALT-------- SAT/FIX  CRC
 A Frame (Attitude) (5hz @ 1200bauds , 10hz >= 2400bauds): 10BYTES
 0x24 0x54 0x41 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xC0
  $     T   A   --PITCH-- --ROLL--- -HEADING-  CRC
 S Frame (Sensors) (2hz @ 1200bauds, 5hz >= 2400bauds): 11BYTES
 0x24 0x54 0x53 0xFF 0xFF  0xFF 0xFF    0xFF    0xFF      0xFF       0xC0
  $     T   S   VBAT(mv)  Current(ma)   RSSI  AIRSPEED  ARM/FS/FMOD   CRC
Merge remote-tracking branch 'remotes/origin/next' into LTM
LTM: missing indent tab
revert stack to 512, no tested enough with lower value.
LTM now not compile by default. Need to be commented out in pios_config.h
Merge branch 'frskytelemetry_allboards' into LTM

Conflicts:
	flight/targets/coptercontrol/board-info/pios_board.h
	flight/targets/coptercontrol/fw/pios_board.c
	flight/targets/coptercontrol/fw/pios_config.h
	flight/targets/flyingf3/board-info/pios_board.h
	flight/targets/flyingf3/fw/pios_board.c
	flight/targets/flyingf4/board-info/pios_board.h
	flight/targets/flyingf4/fw/pios_board.c
	flight/targets/flyingf4/fw/pios_config.h
	flight/targets/freedom/board-info/pios_board.h
	flight/targets/freedom/fw/pios_board.c
	flight/targets/freedom/fw/pios_config.h
	flight/targets/revomini/board-info/pios_board.h
	flight/targets/revomini/fw/pios_board.c
	flight/targets/revomini/fw/pios_config.h
	flight/targets/sparky/board-info/pios_board.h
	flight/targets/sparky/fw/pios_board.c
	flight/targets/sparky/fw/pios_config.h
	shared/uavobjectdefinition/hwcoptercontrol.xml
	shared/uavobjectdefinition/hwflyingf3.xml
	shared/uavobjectdefinition/hwfreedom.xml
	shared/uavobjectdefinition/hwrevomini.xml
	shared/uavobjectdefinition/hwsparky.xml
Merge pull request #1074 from KipK/LTM

New LightTelemetry module.