src: clazy compiler warnings

get rid of most clazy warnings (https://github.com/KDE/clazy)
* range loop use refs
* qcolor ctor with ints
* missing Q_OBJECT macro
* use .constfirst instead of .first

enabled ccache for unix systems for fasterr recompiling
* if ccache is in path we use it now

src/lib_gui/qt/view/graphElements/QtGraphNodeAccess.h

@@ -8,6 +8,7 @@
 class QtGraphNodeAccess
 	: public QtGraphNode
 {
+	Q_OBJECT
 public:
 	QtGraphNodeAccess(AccessKind accessKind);
 	virtual ~QtGraphNodeAccess();

src/lib_gui/qt/view/graphElements/QtGraphNodeBundle.h

@@ -9,6 +9,7 @@ class QtCountCircleItem;
 class QtGraphNodeBundle
 	: public QtGraphNode
 {
+	Q_OBJECT
 public:
 	QtGraphNodeBundle(Id tokenId, size_t nodeCount, Node::NodeType type, std::string name);
 	virtual ~QtGraphNodeBundle();

src/lib_gui/qt/view/graphElements/QtGraphNodeData.h

@@ -8,6 +8,7 @@ class FilePath;
 class QtGraphNodeData
 	: public QtGraphNode
 {
+	Q_OBJECT
 public:
 	QtGraphNodeData(const Node* data, const std::string& name, bool hasParent, bool childVisible, bool hasQualifier);
 	virtual ~QtGraphNodeData();

src/lib_gui/qt/view/graphElements/QtGraphNodeExpandToggle.h

@@ -8,6 +8,7 @@
 class QtGraphNodeExpandToggle
 	: public QtGraphNode
 {
+	Q_OBJECT
 public:
 	QtGraphNodeExpandToggle(bool expanded, int invisibleSubNodeCount);
 	virtual ~QtGraphNodeExpandToggle();

src/lib_gui/qt/view/graphElements/QtGraphNodeQualifier.h

@@ -9,6 +9,7 @@
 class QtGraphNodeQualifier
 	: public QtGraphNode
 {
+	Q_OBJECT
 public:
 	QtGraphNodeQualifier(const NameHierarchy& name);
 	virtual ~QtGraphNodeQualifier();

src/lib_gui/qt/view/graphElements/QtGraphNodeText.h

@@ -6,6 +6,7 @@
 class QtGraphNodeText
 	: public QtGraphNode
 {
+	Q_OBJECT
 public:
 	QtGraphNodeText(const std::string& name);
 	virtual ~QtGraphNodeText();