Rename and split some files

* Rename game_0b28d0.c to modelmgr.c
* Split playerreset.c to modelmgrreset.c
* Split chr.c to proptick.c

src/include/game/chr.h

@@ -4,7 +4,6 @@
 #include "data.h"
 #include "types.h"
 
-void propsTick(void);
 void chrSetChrnum(struct chrdata *chr, s16 chrnum);
 void chrDeregister(s32 chrnum);
 void chrCalculatePushPos(struct chrdata *chr, struct coord *pos, s16 *rooms, bool arg3);

src/include/game/modelmgr.h

@@ -1,5 +1,5 @@
-#ifndef IN_GAME_GAME_0B28D0_H
-#define IN_GAME_GAME_0B28D0_H
+#ifndef IN_GAME_MODELMGR_H
+#define IN_GAME_MODELMGR_H
 #include <ultra64.h>
 #include "data.h"
 #include "types.h"

src/include/game/prop.h

@@ -6,6 +6,8 @@
 
 extern f32 g_AutoAimScale;
 
+void propsTick(void);
+
 void propsSort(void);
 void propEnable(struct prop *prop);
 void propDisable(struct prop *prop);