v0.3(messy cyan): Refactored, No Major Feature Changes

Error Level Refactored

- enum TODOX_ERROR_LEVEL { DEFAULT, ERROR, WARN, INFO, DEBUG };
+ enum TODOX_ERROR_LEVEL { DEFAULT, INFO, WARN, CRITICAL, DEBUG };

$DEFAULT < INFO < WARN < CRITICAL$ and $DEBUG$.

It's natural.

Enhanced DBus Cleanup

now it handles like this:

/* ... */
goto cleanup;

/* ... */
cleanup:
    /* ... */

Actually, dbus.c is totally rewritten and replaced.