[MIRROR] Unit Test rework & Master/Ticker update (#11372)

Co-authored-by: Kashargul <144968721+Kashargul@users.noreply.github.com>
Co-authored-by: C.L. <killer65311@gmail.com>

code/modules/debugging/tracy.dm

@@ -0,0 +1,65 @@
+/// The byond-tracy instance.
+/// This is a GLOBAL_REAL because it is the VERY FIRST THING to initialize, even before the MC or GLOB.
+GLOBAL_REAL(Tracy, /datum/tracy)
+
+/datum/tracy
+	/// Is byond-tracy enabled and running?
+	VAR_FINAL/enabled = FALSE
+	/// The error text, if initializing byond-tracy errored.
+	VAR_FINAL/error
+	/// A description of what / who enabled byond-tracy.
+	VAR_FINAL/init_reason
+	/// A path to the file containing the output trace, if any.
+	VAR_FINAL/trace_path
+
+/datum/tracy/New()
+	if(!isnull(Tracy))
+		CRASH("Attempted to initialize /datum/tracy when global.Tracy is already set!")
+	Tracy = src
+
+/datum/tracy/Destroy()
+#ifndef OPENDREAM_REAL
+	if(enabled)
+		call_ext(TRACY_DLL_PATH, "destroy")()
+#endif
+	return ..()
+
+/// Tries to initialize byond-tracy.
+/datum/tracy/proc/enable(init_reason)
+#ifndef OPENDREAM_REAL
+	if(enabled)
+		return TRUE
+	src.init_reason = init_reason
+	if(!fexists(TRACY_DLL_PATH))
+		error = "[TRACY_DLL_PATH] not found"
+		SEND_TEXT(world.log, "Error initializing byond-tracy: [error]")
+		return FALSE
+
+	var/init_result = call_ext(TRACY_DLL_PATH, "init")("block")
+	if(length(init_result) != 0 && init_result[1] == ".") // if first character is ., then it returned the output filename
+		SEND_TEXT(world.log, "byond-tracy initialized (logfile: [init_result])")
+		enabled = TRUE
+		trace_path = init_result
+		return TRUE
+	else if(init_result == "already initialized") // not gonna question it.
+		enabled = TRUE
+		SEND_TEXT(world.log, "byond-tracy already initialized ([trace_path ? "logfile: [trace_path]" : "no logfile"])")
+		return TRUE
+	else if(init_result != "0")
+		error = init_result
+		SEND_TEXT(world.log, "Error initializing byond-tracy: [init_result]")
+		return FALSE
+	else
+		enabled = TRUE
+		SEND_TEXT(world.log, "byond-tracy initialized (no logfile)")
+		return TRUE
+#else
+	error = "OpenDream not supported"
+	return FALSE
+#endif
+
+/datum/tracy/vv_edit_var(var_name, var_value)
+	return FALSE // no.
+
+/datum/tracy/CanProcCall(procname)
+	return FALSE // double no.