Some changes to internal sprites:

- Added sprites for blast executors & fan particle generators
- Graphical tweaks (outlines, more contrast)

Build/Configurations/SRB2-22.cfg

@@ -5144,7 +5144,7 @@ thingtypes
 		756
 		{
 			title = "Blast Linedef Executor";
-			sprite = "TOADA0";
+			sprite = "internal:blastexec";
 			width = 32;
 			height = 16;
 			angletext = "Tag";
@@ -5154,7 +5154,7 @@ thingtypes
 		757
 		{
 			title = "Fan Particle Generator";
-			sprite = "PRTLA0";
+			sprite = "internal:fanparticles";
 			width = 8;
 			height = 16;
 			angletext = "Tag";