Switch to using string as ids for actions and conditions

Using int is an id was getting messy with more and more conditions and
actions beeing added.
It also made the order of conditions and actions in the respective
comboboxes unchangable as there was a 1 to 1 relation of index and id.

src/macro-action-source.cpp

@@ -2,7 +2,7 @@
 #include "headers/advanced-scene-switcher.hpp"
 #include "headers/utility.hpp"
 
-const int MacroActionSource::id = 9;
+const std::string MacroActionSource::id = "source";
 
 bool MacroActionSource::_registered = MacroActionFactory::Register(
 	MacroActionSource::id,