Add 'standby' parameter to helper SCTRL

Helpers inherit standby flag from root characters. By using this parameter, a character can force a specific standby for its helper, regardless of the standby value of the character itself.

src/bytecode.go

@@ -2944,6 +2944,7 @@ const (
 	helper_immortal
 	helper_kovelocity
 	helper_preserve
+	helper_standby
 )
 
 func (sc helper) Run(c *Char, _ []int32) bool {
@@ -3050,6 +3051,12 @@ func (sc helper) Run(c *Char, _ []int32) bool {
 			if exp[0].evalB(c) {
 				h.preserve = sys.round
 			}
+		case helper_standby:
+			if exp[0].evalB(c) {
+				h.setSCF(SCF_standby)
+			} else {
+				h.unsetSCF(SCF_standby)
+			}
 		}
 		return true
 	})

src/compiler_functions.go

@@ -548,6 +548,10 @@ func (c *Compiler) helper(is IniSection, sc *StateControllerBase, _ int8) (State
 			helper_preserve, VT_Bool, 1, false); err != nil {
 			return err
 		}
+		if err := c.paramValue(is, sc, "standby",
+			helper_standby, VT_Bool, 1, false); err != nil {
+			return err
+		}
 		return nil
 	})
 	return *ret, err