Introduce more modern way of for parsing date/time/timestamp formats #98
Description
Currently parsing ibase.timestampformat, ibase.dateformat, ibase.timeformat uses strptime(). It is deprecated by PHP, is not supported or does work differently on different platforms and missing features like fractions and proper time zone support. In case this function is not available, extension falls back to parsing of arbitrary format "%d%*[/]%d%*[/]%d %d%*[:]%d%*[:]%d" which is not documented.
Introduce fbrid.timestampformat, fbird.dateformat, fbird.timeformat and parse it with PHP date parsing facilities.