Due to floating-point rounding and representation errors, filters could
wrongly display results incongruous with the wedge display text (ie.
a beatmap with the BPM of 139.99999 would be displayed as having 140
BPM and also pass the bpm<140 filter).
Apply tolerance when parsing floating-point constraints. The tolerance
chosen is half of what the UI displays for the particular values (so
for example half of 0.1 for AR/DR/CS, 0.01 for stars, etc.)
Tests updated accordingly.
70842f71f4