Improve counthints

[bwl21]

countnotes should be improved such that

• punctuated notes are counted more precisely, , e.g '1-u-2' instead of '1-2'
• notes starting off a full beat

Solution

• [x] tokenize the raw count notes
• [x] find the characters to be deleted by regular expressions
  • find the minimum count accuracy necessary to express precise counting; one of \d, u
  • remove the counts which are smaller then the minimum count accuracy.