qmljs: improve handling of qml dialects

Language::Enum -> QmlDialect
 * class instead of enum
 * moved Language specific operations to it (from Document)
 * nicer handling
QStringList -> PathsAndLanguages
 * store language along with path, to perform a correct scan and improve
   path handling

Change-Id: If69d35c63cfeb48aa670b51870916cd0c40f1916
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>

src/libs/qmljs/qmljs-lib.pri

@@ -44,7 +44,8 @@ HEADERS += \
     $$PWD/qmljsconstants.h \
     $$PWD/qmljsimportdependencies.h \
     $$PWD/qmljsviewercontext.h \
-    $$PWD/qmljsdescribevalue.h
+    $$PWD/qmljsdescribevalue.h \
+    $$PWD/qmljsdialect.h
 
 SOURCES += \
     $$PWD/qmljsbind.cpp \
@@ -80,7 +81,8 @@ SOURCES += \
     $$PWD/qmljsqrcparser.cpp \
     $$PWD/qmljsimportdependencies.cpp \
     $$PWD/qmljsviewercontext.cpp \
-    $$PWD/qmljsdescribevalue.cpp
+    $$PWD/qmljsdescribevalue.cpp \
+    $$PWD/qmljsdialect.cpp
 
 
 RESOURCES += \