close #30 added overwritable help command parameter and fixed some compiler issues (some of them only appeared when compiling with optimization)

src/shellmatta_utils.c

@@ -327,7 +327,12 @@ static shellmatta_retCode_t helpCmdFct(shellmatta_handle_t handle, const char *a
 
     return ret;
 }
-shellmatta_cmd_t helpCmd = {(char*)"help", (char*)"h", (char*)"Print this help text", (char*)"help", helpCmdFct, NULL};
+shellmatta_cmd_t helpCmd = {  SHELLMATTA_HELP_COMMAND
+                            , SHELLMATTA_HELP_ALIAS
+                            , SHELLMATTA_HELP_HELP_TEXT
+                            , SHELLMATTA_HELP_USAGE_TEXT
+                            , helpCmdFct
+                            , NULL};
 
 /**
  * @brief       terminates an input and prints the prompt again