Added C99 support, refactored headers

src/cosmo.h

@@ -20,12 +20,17 @@
 // forward declare *most* stuff so our headers are cleaner
 typedef struct CState CState;
 typedef struct CChunk CChunk;
+typedef struct CCallFrame CCallFrame;
+
 #ifdef NAN_BOXXED
 typedef union CValue CValue;
 #else
 typedef struct CValue CValue;
 #endif
 
+typedef struct CValueArray CValueArray;
+typedef uint32_t cosmo_Flag;
+
 // objs
 typedef struct CObj CObj;
 typedef struct CObjString CObjString;