Search results improvements and added functionalities.

[herronelou]

Refined filtering of search results:

• Consecutive finds are weighted higher than non-consecutive
• '*' disables anchoring ('*blur' will return 'blur' and 'motionblur')
• '**' forces results to be un-anchored ('**blur' will return 'motionblur' but not 'blur')
• using '[' as the first character now also disables anchoring (previously would return nothing)
• using ' ' (double space) still becomes '['
• using ' ' (space) still disables non-consecutive search.