Initial commit of utility to dump shared system font.

Initial commit of 3ds utilities homebrew application. This app follows the same format as https://github.com/citra-emu/hwtests, except further "utilities" can be added instead of tests. This PR adds the first such utility, which dumps your shared system font from RAM (as needed by Citra to boot certain games and system titles). I foresee other such utilities being added in the future.