Refactors virus spreading

code/__DEFINES/diseases.dm

@@ -0,0 +1,26 @@
+//Visibility Flags
+#define HIDDEN_SCANNER	1
+#define HIDDEN_PANDEMIC	2
+
+//Disease Flags
+#define CURABLE		1
+#define CAN_CARRY	2
+#define CAN_RESIST	4
+
+//Spread Flags
+#define VIRUS_SPREAD_SPECIAL 1
+#define VIRUS_SPREAD_NON_CONTAGIOUS 2
+#define VIRUS_SPREAD_BLOOD 4
+#define VIRUS_SPREAD_CONTACT_FLUIDS 8
+#define VIRUS_SPREAD_CONTACT_SKIN 16
+#define VIRUS_SPREAD_AIRBORNE 32
+
+
+//Severity Defines
+#define VIRUS_SEVERITY_POSITIVE		"Positive"  //Diseases that buff, heal, or at least do nothing at all
+#define VIRUS_SEVERITY_NONTHREAT	"Harmless"  //Diseases that may have annoying effects, but nothing disruptive (sneezing)
+#define VIRUS_SEVERITY_MINOR		"Minor"	    //Diseases that can annoy in concrete ways (dizziness)
+#define VIRUS_SEVERITY_MEDIUM		"Medium"    //Diseases that can do minor harm, or severe annoyance (vomit)
+#define VIRUS_SEVERITY_HARMFUL		"Harmful"   //Diseases that can do significant harm, or severe disruption (brainrot)
+#define VIRUS_SEVERITY_DANGEROUS 	"Dangerous" //Diseases that can kill or maim if left untreated (flesh eating, blindness)
+#define VIRUS_SEVERITY_BIOHAZARD	"BIOHAZARD" //Diseases that can quickly kill an unprepared victim (fungal tb, gbs)