fix DrawText func && add enum with text encoding && update manual && other

src/syscalls.c

@@ -1855,7 +1855,7 @@ LUALIB_API int luaopen_syscalls(lua_State* L)
 	syscalls_push_windowStyles(L);
 	syscalls_push_buttons(L);
 	syscalls_push_connectionStatus(L);
-	syscalls_push_textSizes(L);
+	syscalls_push_graphic(L);
 
 	syscalls_register_ARPEntry(L);
 	syscalls_register_SystemColors(L);