Renamed wifi to udp and started using PprzTransport again
Fixing issue that arised after commit 1de769b6f20679419e0baf41b1ab87413f7972c6, compiles fine. Test flight needed.
[mcu_periph] gpio helper functions

also removed the old gpio1 that was used on lpc and fixedwing firmware
GLS (new)

implemented a new intercept that takes into account wind on final and APP_Angle
fixed desired altitude to match the actual setpoint
should work now with any type of vertical control since all control parameters have been removed

closes #453
[conf] fix some example GLS_APPROACH defines
[stm32] spektrum for F4

Not tested on an actual F4 board!
Using some of the new gpio helper functions.
Also removed seemingly useless DebugInit.
[stm32][i2c] pin configuration in board files

Use the gpio_enable_clock helper function.
Also remove the unused scl_pin and sda_pin variables in the i2c struct.
[conf][stm32] spektrum defines for Lisa/L
[stm32][conf] fix UART1_GPIO_RX on lisa/m
[stm32] i2c3 for stm32f4, untested
[stm32][ppm] config cleanup
[boards] add missing defines for lisa/l board
[rotorcraft] fix stabilization_attitude_read_rc_setpoint_eulers

Reported by Ewoud.
The constants max_phi_scale etc. were zero because it is an integer divide
where the denominator is larger (depending on STABILIZATION_ATTITUDE_SP_MAX_PHI).
This causes the euler setpoint to always be zero.

Closes #461
[peripherals][imu] i2c slaves for the mpu60x0

new IMU drivers using the mpu60x0 peripheral with slave support
- aspirin 2 (spi) driver with mag as real slave
- drotek 10dof v2 with mag as passthrough slave (untested and axes might be wrong)

closes #450
closes #190
[rotorcraft] rc euler read in fixed point

closes #462
[airframe] updating some ENAC airframes