WIP: Added page showing list of functions.

Only list is shown, still working on details.

core/core.pro

@@ -58,7 +58,8 @@ HEADERS += PasswordManager.h \
     SqlAstSelectList.h \
     SqlAstSelectListEntry.h \
     SqlAstSelect.h \
-    SqlAstExpression.h
+    SqlAstExpression.h \
+    std_utils.h
 	
 unix {
     target.path = /usr/lib

core/std_utils.h

@@ -0,0 +1,14 @@
+#ifndef STD_UTILS_H
+#define STD_UTILS_H
+
+#include <vector>
+
+template <typename T>
+const T& value_or(const std::vector<T> &vec, const size_t index, const T &def)
+{
+	if (index < 0 || index >= vec.size())
+		return def;
+	return vec[index];
+}
+
+#endif // STD_UTILS_H