[control] rework the stabilization for rotorcraft (#3248)

Introducing several changes to the control stask for the stabilization:
- new structures: stabilization, stab (att and/or rates) and thrust (vector)
- more functional approach: stabilization receives the stab and thrust
  setpoints from guidance and fill command vector at the end
- modes and sub-modes are redefined (split stab and guidance modes),
  some AP modes are removed (FLIP and MODULE)
- RC read functions are removed and replaced by ABI bindings, one for
  each part (AP, stab, guidance_h, guidance_v) with dedicated functions
- transition ratio (float in [0-1]) replace transition_percentage (int)
- the AP_MODULE mode is replaced by generated autopilot
- the ABI hack for guidance indi is not needed anymore
- AP generator supports a new 'store' attribute to use return values of
  functions
- cleaning of the stabilization API (for setter functions)

conf/modules/ctrl_module_outerloop_demo.xml

@@ -19,9 +19,11 @@
   <header>
     <file name="ctrl_module_outerloop_demo.h"/>
   </header>
+  <init fun="ctrl_module_init()"/>
 
   <makefile>
     <file name="ctrl_module_outerloop_demo.c"/>
+    <test firmware="rotorcraft"/>
   </makefile>
 
 </module>