Return txt string transformed in ascii art banner with specified font (default: standard.flf)

FONT LIST (http://www.figlet.org)

3-d, 3x5, 5lineoblique, acrobatic, alligator, alligator2, alphabet, avatar, banner, banner3-D, banner3, banner4, barbwire, basic, bell, big, bigchief, binary, block, bubble, bulbhead, calgphy2, caligraphy, catwalk, chunky, coinstak, colossal, computer, contessa, contrast, cosmic, cosmike, cricket, cursive, cyberlarge, cybermedium, cybersmall, diamond, digital, doh, doom, dotmatrix, drpepper, eftichess, eftifont, eftipiti, eftirobot, eftitalic, eftiwall, eftiwater, epic, fender, fourtops, fuzzy, goofy, gothic, graffiti, hollywood, invita, isometric1, isometric2, isometric3, isometric4, italic, ivrit, jazmine, jerusalem, katakana, kban, larry3d, lcd, lean, letters, linux, lockergnome, madrid, marquee, maxfour, mike, mini, mirror, mnemonic, morse, moscow, nancyj-fancy, nancyj-underlined, nancyj, nipples, ntgreek, o8, ogre, pawp, peaks, pebbles, pepper, poison, puffy, pyramid, rectangles, relief, relief2, rev, roman, rot13, rounded, rowancap, rozzo, runic, runyc, sblood, script, serifcap, shadow, short, slant, slide, slscript, small, smisome1, smkeyboard, smscript, smshadow, smslant, smtengwar, speed, stampatello, standard, starwars, stellar, stop, straight, tanja, tengwar, term, thick, thin, threepoint, ticks, ticksslant, tinker-toy, tombstone, trek, tsalagi, twopoint, univers, usaflag, wavy, weird.