Partially fixed the critical bug mentioned in the previous revision.

- runcbs->on_enter() is introduced and called when all 
  globals variables are ready.
- changed runcbs->on_start() to return an integer
- run_main() is still under reconstruction. currently it 
  only supports the BEGIN/pattern action/END block exection.

qse/lib/cmn/pcp.c

@@ -95,8 +95,6 @@ qse_pcp_t* qse_pcp_init (
 	};
 	int i, minidx = -1, maxidx = -1;
 
-	QSE_ASSERT (QSE_COUNTOF(pcp->hanlde) == QSE_COUNTOF(handle));
-
 	QSE_MEMSET (pcp, 0, QSE_SIZEOF(*pcp));
 	pcp->mmgr = mmgr;