Add generic vtol tailsitter airframe/mixer and incorporate modifications from PR 9849 in 4001_quad_x and 13001_caipirinha_vtol.

ROMFS/px4fmu_common/init.d/airframes/13001_caipirinha_vtol

@@ -17,16 +17,20 @@ sh /etc/init.d/rc.vtol_defaults
 
 if [ $AUTOCNF = yes ]
 then
+	param set MAV_TYPE 19
+
 	param set MC_ROLL_P 6
 	param set MC_ROLLRATE_P 0.12
 	param set MC_ROLLRATE_I 0.002
 	param set MC_ROLLRATE_D 0.003
 	param set MC_ROLLRATE_FF 0
+
 	param set MC_PITCH_P 4.5
 	param set MC_PITCHRATE_P 0.3
 	param set MC_PITCHRATE_I 0.002
 	param set MC_PITCHRATE_D 0.003
 	param set MC_PITCHRATE_FF 0
+
 	param set MC_YAW_P 3.8
 	param set MC_YAWRATE_P 0.22
 	param set MC_YAWRATE_I 0.02
@@ -37,10 +41,13 @@ then
 	param set VT_ELEV_MC_LOCK 0
 	param set VT_MOT_ID 12
 	param set VT_TYPE 0
+
+	# Indicate that FW roll direction was fixed in mixer, to be removed in v1.10
+	param set V19_VT_ROLLDIR 0
 fi
 
 set MAV_TYPE 19
 
-set MIXER caipirinha_vtol
+set MIXER vtol_tailsitter_duo
 
 set PWM_OUT 1234

ROMFS/px4fmu_common/init.d/airframes/13200_generic_vtol_tailsitter

@@ -0,0 +1,30 @@
+#!/bin/sh
+#
+# @name Generic Tailsitter
+#
+# @type VTOL Duo Tailsitter
+# @class VTOL
+#
+# @output MAIN1 motor right
+# @output MAIN2 motor left
+# @output MAIN5 elevon right
+# @output MAIN6 elevon left
+#
+# @maintainer Roman Bapst <roman@px4.io>
+#
+
+sh /etc/init.d/rc.vtol_defaults
+
+if [ $AUTOCNF = yes ]
+then
+	param set VT_ELEV_MC_LOCK 0
+	param set VT_MOT_COUNT 2
+	param set VT_TYPE 0
+
+	param set MAV_TYPE 19
+fi
+
+set MAV_TYPE 19
+set MIXER vtol_tailsitter_duo
+
+set PWM_OUT 1234

ROMFS/px4fmu_common/init.d/airframes/4001_quad_x

@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# @name Generic Quadrotor x
+# @name Generic Quadcopter
 #
 # @type Quadrotor x
 # @class Copter

ROMFS/px4fmu_common/init.d/airframes/CMakeLists.txt

@@ -132,6 +132,7 @@ px4_add_romfs_files(
 	13010_claire
 	13012_convergence
 	13013_deltaquad
+	13200_generic_vtol_tailsitter
 
 	# [14000, 14999] Tri Y
 	14001_tri_y_yaw+