added four more axis to joystick handlers (fixes #1063)

src/common/JoyMap.hxx

@@ -129,10 +129,10 @@ class JoyMap
       size_t operator()(const JoyMapping& m)const {
         return std::hash<uInt64>()((static_cast<uInt64>(m.mode)) // 3 bits
           + ((static_cast<uInt64>(m.button)) * 7)  // 3 bits
-          + (((static_cast<uInt64>(m.axis)) << 0)  // 2 bits
-           | ((static_cast<uInt64>(m.adir)) << 2)  // 2 bits
-           | ((static_cast<uInt64>(m.hat )) << 4)  // 1 bit
-           | ((static_cast<uInt64>(m.hdir)) << 5)  // 2 bits
+          + (((static_cast<uInt64>(m.axis)) << 0)  // 3 bits
+           | ((static_cast<uInt64>(m.adir)) << 3)  // 2 bits
+           | ((static_cast<uInt64>(m.hat )) << 5)  // 1 bit
+           | ((static_cast<uInt64>(m.hdir)) << 6)  // 2 bits
             ) * 61
         );
       }

src/common/jsonDefinitions.hxx

@@ -31,7 +31,11 @@ NLOHMANN_JSON_SERIALIZE_ENUM(JoyAxis, {
   {JoyAxis::X, "x"},
   {JoyAxis::Y, "y"},
   {JoyAxis::Z, "z"},
-  {JoyAxis::A3, "a3"}
+  {JoyAxis::A3, "a3"},
+  {JoyAxis::A4, "a4"},
+  {JoyAxis::A5, "a5"},
+  {JoyAxis::A6, "a6"},
+  {JoyAxis::A7, "a7"}
 })
 
 NLOHMANN_JSON_SERIALIZE_ENUM(JoyDir, {

src/emucore/EventHandlerConstants.hxx

@@ -52,6 +52,10 @@ enum class JoyAxis: Int8 {
   Y = 1,    // since they'll be used as array indices
   Z = 2,
   A3 = 3,
+  A4 = 4,
+  A5 = 5,
+  A6 = 6,
+  A7 = 7,
   NONE = JOY_CTRL_NONE
 };