Provide Time of Day as Artificial Property

In addition to the creation date and last modification date we need to add an artificial property that holds the time of day.

• Creation Time, e.g. 10:39 AM
• Creation Time$, e.g. 10:39:27 AM
• Creation Time§, e.g. 103927
• Last Modification Time, e.g. 1:00 PM
• Last Modification Time$, e.g. 1:00:41 PM
• Last Modification Time§, e.g. 130041

The format of the first two (...Time and ...Time$) is derived from the formatter provided by Confluence. The last (...Time§, normalized) is the format HHmmss.

Note that existing pages must be reindexed to generate the artificial properties.