When there is a bigger project, then task list scanning takes a few minutes. The results of scanning should be cashed,
so the next time when the ide is started, the scan doesn't have to run again. It can be used the same technique like is
used for indexing.
task list uses indexing api to cache scanned tasks
Integrated into 'main-golden', will be available in build *200904020200* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress)
User: S. Aubrecht <email@example.com>
Log: #148704 - switching task list to use indexing api, part 2