Add setting for milliseconds per game tick mode

src/table/settings/settings.ini

@@ -3251,6 +3251,21 @@ strval   = STR_CONFIG_SETTING_CARGO_PAYMENT_ALGORITHM_TRADITIONAL
 cat      = SC_BASIC
 patxname = ""economy.payment_algorithm""
 
+[SDT_VAR]
+var      = economy.tick_rate
+type     = SLE_UINT8
+flags    = SF_GUI_DROPDOWN
+def      = TRM_TRADITIONAL
+min      = TRM_BEGIN
+max      = TRM_END - 1
+interval = 1
+str      = STR_CONFIG_SETTING_TICK_RATE
+strhelp  = STR_CONFIG_SETTING_TICK_RATE_HELPTEXT
+strval   = STR_CONFIG_SETTING_TICK_RATE_TRADITIONAL
+cat      = SC_EXPERT
+post_cb  = [](auto) { SetupTickRate(); }
+patxname = ""economy.tick_rate""
+
 ##
 [SDT_VAR]
 var      = pf.wait_for_pbs_path