replace remaining Fade usage in non-stage code

src/boss.c

@@ -1160,7 +1160,7 @@ void process_boss(Boss **pboss) {
 					.pos = boss->pos,
 					.timeout = vrng_range(rng[2], 60, 70),
 					.rule = linear,
-					.draw_rule = Fade,
+					.draw_rule = pdraw_timeout_fade(1, 0),
 					.args = { vrng_range(rng[0], 3, 13) * vrng_dir(rng[1]) },
 				);
 			}

src/item.c

@@ -149,7 +149,7 @@ Item *create_clear_item(cmplx pos, uint clear_flags) {
 			.sprite = "flare",
 			.pos = pos,
 			.timeout = 30,
-			.draw_rule = Fade,
+			.draw_rule = pdraw_timeout_fade(1, 0),
 			.layer = LAYER_BULLET+1
 		);
 

src/plrmodes/reimu_a.c

@@ -190,7 +190,7 @@ static void reimu_spirit_bomb_impact_balls(cmplx pos, int count) {
 			.args = { cdir(2 * M_PI / count * (i + offset)) * 15 },
 			.angle = rng_angle(),
 			.rule = linear,
-			.draw_rule = Fade,
+			.draw_rule = pdraw_timeout_fade(1, 0),
 			.layer = LAYER_BOSS,
 			.flags = PFLAG_NOREFLECT | PFLAG_REQUIREDPARTICLE,
 		);

src/plrmodes/youmu_a.c

@@ -453,7 +453,7 @@ static int youmu_mirror_bomb_controller(Enemy *e, int t) {
 			.sprite = "arc",
 			.pos = e->pos,
 			.rule = linear,
-			.draw_rule = Fade,
+			.draw_rule = pdraw_timeout_fade(1, 0),
 			.color = RGBA(0.9, 0.8, 1.0, 0.0),
 			.timeout = 30,
 			.args = {

src/projectile.c

@@ -1111,10 +1111,12 @@ ProjDrawRule pdraw_timeout_scalefade(cmplx32 scale0, cmplx32 scale1, float32 opa
 }
 
 ProjDrawRule pdraw_timeout_scale(cmplx32 scale0, cmplx32 scale1) {
+	// TODO: specialized code path without fade component
 	return pdraw_timeout_scalefade(scale0, scale1, 1, 1);
 }
 
 ProjDrawRule pdraw_timeout_fade(float32 opacity0, float32 opacity1) {
+	// TODO: specialized code path without scale component
 	return pdraw_timeout_scalefade(1+I, 1+I, opacity0, opacity1);
 }