[actuators] more actuator drivers with new interface
[energyctl] save gains
[fix ap-fbw] sim now compiles
[fix] no error when missing a airframe parameter in energy-ctrl
[sw/ext] removed stm32loader submodule and added the files to sw/tools
source files should not be executable
removed some long deprecated subsystem makefiles
[actuators] first test with 2 drivers

- actuators are now in signed int16 (need to check size again) (int32 ?)
- servo_switch module replaces booz_drop
- booz_pwm is now handled by actuators_direct
[dox] generated doxygen html docs go to doc/generated/html by default, removed useless make target
[dox] latex formulas and dot graph in doxygen for energy_ctrl
[actuators] servo_switch directly controls actuators again
[actuators] dummy actuators driver (really needed ?)
[actuators] reordering pwm_direct servos so it makes some sense
[actuators] converting more actuators drivers

- heli looks obsolete and should be replaced by one of the pwm driver
- pwm_supervion is merged into pwm (direct)
- maybe supervision should have its own subsystem
[actuators] fix some Set macros
change vsupply to be a uint16 to enable reporting of voltages higher than 25.5V
fixes #294
closes #295
[fix] link_mcu_uart for 16bit vsupply
[fix] update ezosd current sensor module for 16bit vsupply
[fix:dc] release camera button on init
[modules] fix doc for digital_cam