Rewrite the assembly pipeline.

This patch uses SmxBuilder from spcomp2 to replace the old assemble()
pipeline. Instead of generating into an old AMX structure, and then
decoding that into SMX, we now directly generate into SMX. This greatly
simplifies code generation and smx building.

sourcepawn/compiler/sc.h

@@ -578,13 +578,6 @@ void pc_resetasm(void *handle);
 int  pc_writeasm(void *handle,const char *str);
 char *pc_readasm(void *handle,char *target,int maxchars);
 
-/* output to binary (.AMX) file */
-void *pc_openbin(char *filename);
-void pc_closebin(void *handle,int deletefile);
-void pc_resetbin(void *handle,long offset);
-int  pc_writebin(void *handle,void *buffer,int size);
-long pc_lengthbin(void *handle); /* return the length of the file */
-
 void sp_fdbg_ntv_start(int num_natives);
 void sp_fdbg_ntv_hook(int index, symbol *sym);
 
@@ -767,7 +760,7 @@ int error(int number,...);
 void errorset(int code,int line);
 
 /* function prototypes in SC6.C */
-int assemble(void *fout,void *fin);
+void assemble(const char *outname, void *fin);
 
 /* function prototypes in SC7.C */
 void stgbuffer_cleanup(void);