AP_RCMapper: add static create method

libraries/AP_RCMapper/AP_RCMapper.h

@@ -4,12 +4,15 @@
 #include <AP_Common/AP_Common.h>
 #include <AP_Param/AP_Param.h>
 
-class RCMapper
-{
+class RCMapper {
 public:
-    /// Constructor
-    ///
-    RCMapper();
+    static RCMapper create() { return RCMapper{}; }
+
+    constexpr RCMapper(RCMapper &&other) = default;
+
+    /* Do not allow copies */
+    RCMapper(const RCMapper &other) = delete;
+    RCMapper &operator=(const RCMapper&) = delete;
 
     /// roll - return input channel number for roll / aileron input
     uint8_t roll() const { return _ch_roll; }
@@ -32,6 +35,8 @@ public:
     static const struct AP_Param::GroupInfo var_info[];
 
 private:
+    RCMapper();
+
     // channel mappings
     AP_Int8 _ch_roll;
     AP_Int8 _ch_pitch;