[analyser] timesketch full rewrite / revamp

[cvandeplas]

Completely re-assess the timesketch analyser as with the change of model to time-based events it becomes redundant.

• Code of a human readable summary should be merged to the parser, in a kind of metadata field with subfields
• Timesketch analyser should only do the timestamp and data-format conversion of all other data, just to ensure the mandatory timesketch fields are there and in the right format.

In the meantime the timesketch analyser is declared broken and disabled (changed file extension to .broken