libtracker-fts: Fix reentrancy issues in the TrackerTokenizer
libtracker-fts: Fix reentrancy issues in the TrackerTokenizer

The internal TrackerParser must be per-cursor, as several cursors
may be opened simultaneously.

outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,hoheinzollern/tracker