[settings] improve settings in pprzcenter

- check box for faster enable/disable
- loading from modules
[settings] add a few more settings in modules
[settings] variable size modules settings area
[settings] add settings directly inside modules files
[settings] allow several groups of settings in modules
[settings] move settings to module files and remove old files
[settings] fix example conf
fix conf_example
remove another unneeded settings file
[intermcu] intermcu over CAN link from lisa to lisa
[intermcu_can] main_fbw calling
[link_mcu_can] Call from main
[intermcu] common link_mcu.h header
[gcs] select an aircraft directly with a click on the map
[intermcu] style fix
Merge pull request #841 from paparazzi/link_mcu_can

intermcu link via CAN
[FBW] Compile less overhead in FBW
[FBW] no need for i2c when there is no i2c
[modules] add missing default case in cam
[generators] gen_airframe: don't force float if unit = code_unit