qmljs: added qmljsconstants.h

Moved Document::Language, Import::Type and StaticAnalysis::Severity
enums to qmljsconstants.h and renamed values removing the redundant
part.
Thus the effective length changed little or improved
(Document::QmlLanguage => Language::Qml).

The separate file allows better reuse of enum values without introducing
circular dependencies.

Change-Id: I5186d7c04f5d3f6c289068b919be5ff1ff118326
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@digia.com>

src/libs/qmljs/parser/qmljsengine_p.h

@@ -44,6 +44,7 @@
 #include "qmljsglobal_p.h"
 #include "qmljsastfwd_p.h"
 #include "qmljsmemorypool_p.h"
+#include <qmljs/qmljsconstants.h>
 
 #include <QString>
 #include <QSet>
@@ -59,21 +60,19 @@ class MemoryPool;
 class QML_PARSER_EXPORT DiagnosticMessage
 {
 public:
-    enum Kind { Warning, Error };
-
     DiagnosticMessage()
-        : kind(Error) {}
+        : kind(Severity::Error) {}
 
-    DiagnosticMessage(Kind kind, const AST::SourceLocation &loc, const QString &message)
+    DiagnosticMessage(Severity::Enum kind, const AST::SourceLocation &loc, const QString &message)
         : kind(kind), loc(loc), message(message) {}
 
     bool isWarning() const
-    { return kind == Warning; }
+    { return kind == Severity::Warning; }
 
     bool isError() const
-    { return kind == Error; }
+    { return kind == Severity::Error; }
 
-    Kind kind;
+    Severity::Enum kind;
     AST::SourceLocation loc;
     QString message;
 };