GUI: move shared enums to 'GUI/Support/Data/ID.h'

Joins three homeless enums in GUI/Support/Data/ID.h

This resolves #447 (closed)

GUI/Model/Project/ProjectDocument.cpp

@@ -56,7 +56,7 @@ ProjectDocument::ProjectDocument()
     , m_singleSampleMode(false)
     , m_functionalities(All)
     , m_instrumentEditController(&m_instrumentModel)
-    , m_lastViewActive(GUI::ID::ViewId::INSTRUMENT)
+    , m_lastViewActive(GUI::ID::ViewId::Instrument)
 {
     connect(&m_instrumentEditController, &InstrumentsEditController::instrumentAddedOrRemoved, this,
             &ProjectDocument::onModelChanged, Qt::UniqueConnection);