Standardises on const [Half]Cycles as the thing called and returned, rather than const [Half]Cycles & as it's explicitly defined to be only one int in size, so using a reference is overly weighty.

Machines/Oric/Microdisc.cpp

@@ -104,7 +104,7 @@ void Microdisc::set_head_load_request(bool head_load) {
 	}
 }
 
-void Microdisc::run_for(const Cycles &cycles) {
+void Microdisc::run_for(const Cycles cycles) {
 	if(head_load_request_counter_ < head_load_request_counter_target) {
 		head_load_request_counter_ += cycles.as_int();
 		if(head_load_request_counter_ >= head_load_request_counter_target) set_head_loaded(true);