Make McuToolChainPackage::Type an enum class

And make more use of switch statements without a default case, so each
type is handled explicitly. (Ok, there is a default, but that is
Q_UNREACHABLE).

Change-Id: I30ccc447e55a5aeebebe1a9879ea3136545f5e68
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>
Reviewed-by: <piotr.mucko@qt.io>

src/plugins/mcusupport/mcupackage.h

@@ -122,15 +122,15 @@ private:
 class McuToolChainPackage : public McuPackage
 {
 public:
-    enum Type {
-        TypeArmGcc,
-        TypeIAR,
-        TypeKEIL,
-        TypeGHS,
-        TypeMSVC,
-        TypeGCC,
-        TypeGHSArm,
-        TypeUnsupported
+    enum class Type {
+        IAR,
+        KEIL,
+        MSVC,
+        GCC,
+        ArmGcc,
+        GHS,
+        GHSArm,
+        Unsupported
     };
 
     McuToolChainPackage(const QString &label,