[agl] use ground_alt from autopilot if no SRTM data available
[agl] fix waypoint edit box display and sim ground detect
[srtm] improving information messages about SRTM data
[ground_alt] remove ground_alt from rotorcraft firmware

use directly state interface ref alt

ground_alt and state ref was getting out of sync when calling geo_init
only one time, making issues with nps when setting initial position far
from the flight plan ref
[airframes] First Re-order, so they can be compared/merged
[airframes] Merged with TUDelft
update changelog
[ground_alt] add GetAltRef() to FW nav and update flight plans
[airframe] update airframe file
[test] remove/cleanup old lisa tests
[stm32] move uart_tunnel from lisa to arch
[module] gas-engine idle trim & cut-off
add test_imu target

spi_master.makefile: add spi to all targets
[xsens700] Checked signs with real hardware.
[airframes] two times same, one not compiling
removed unused OVERRIDE_UARTx_IRQ_HANDLER
cleanup trailing whitespaces
[separate FBW-AP] Transfer RC-channels from radio.h, send COMMANDS and FBW_STATUS from the ap side.

closes #726
[intermcu_uart] Naming convention: PORT_NR=1 -> PORT=UART1
[link_mcu] replace _BV by bit_is_set