Feature request: filtering plug-ins

[joosbuijs]

It would be nice to have the following filtering plug-ins:

1. Remove all activities in a trace before/after a provided activity
2. Filter traces starting/ending with activity X or with the top x% of activities (e.g. the 'filter event log using heuristics' plugin by Eric Verbeek). Here I see 2 variants: one with keep activities that start/end with the activities covering x% of the traces (e.g. the percentage slider in the plug-in). A second variant would take a string list in the parameters that keep traces that start/end with those activities.
   See org.processmining.plugins.log.logfilters.ui.logfilterplugin in the Log package for the ProM plug-in entry.

[abolt]

Request 1 and 2.1 are doable in a reasonable time.
Request 2.2 is feasible, but is more tricky to provide a list of activities... (more UI has to be programmed)