accept %o and %O (as %j) - special case functions and strings to %o (or %j)

this mainly improves pino-debug output, since debug supports %o and libraries like express make extensive use of it

changes have no speed hit (node 6 checked)

change:

quickLowres*100000: 268.242ms
quick*100000: 293.952ms
quickLowres*100000: 260.914ms
quick*100000: 287.245ms

master: 

quickLowres*100000: 265.964ms
quick*100000: 301.656ms
quickLowres*100000: 256.617ms
quick*100000: 298.928ms

pinojs / quick-format-unescaped

accept %o and %O (as %j) - special case functions and strings to %o (or %j) #7