v7.4-beta.1

v7.4-beta.1

• Issue #3749 : Replace Stroom simple cron scheduler with standard compliant Quartz cron scheduler.

• Issue #4041 : Improve date picker.

• Issue #4131 : Make Stroom's standard date parsing more lenient to accept various forms of ISO 8601 zoned date times, e.g. with varying number of fractional second digits, no fractional seconds, no seconds, different offset forms ('+02', '+0200', '+02:00', etc.). Normalise EffectiveTime and ReceivedTime header values so the dates are in Stroom's standard format.