Rename mpIsOptionAvailable to mpIsChallengeComplete and related symbols

src/include/constants.h

@@ -88,6 +88,10 @@
 #define CASING_RIFLE    2
 #define CASING_SHOTGUN  3
 
+// Challenge numbers don't appear to be a 1:1 mapping :(
+#define CHALLENGE_7     30
+#define CHALLENGE_UNK64 64
+
 #define CHANNEL_0  0
 #define CHANNEL_1  1
 #define CHANNEL_2  2

src/include/game/game_1999b0.h

@@ -59,6 +59,6 @@ u32 func0f19c47c(void);
 void func0f19c4b8(s32 arg0, s32 arg1, s32 numplayers, s32 arg3);
 u32 func0f19c53c(void);
 void func0f19c6bc(void);
-bool mpIsOptionAvailable(s32 option);
+bool mpIsChallengeComplete(s32 challenge);
 
 #endif

src/include/gvars/gvars.h

@@ -858,7 +858,7 @@ extern u32 var800acc70;
 extern u32 var800acc74;
 extern u32 var800acc80;
 extern u32 var800acca0;
-extern u8 g_MpAvailableOptions[];
+extern u8 g_MpChallengesCompleted[];
 extern u32 var800acd20;
 extern u32 var800ad158;
 extern u32 var800ad1a0;