* Added lines in between bars
* Changed bar lines to follow snap size
* Changed default zoom and quantization value
* Added constants for line widths
* Added QSS configuration for new grid line colors
* Tied line widths to QSS properties
* Changed default quantization to 1/4
* Removed clear() from destructor model
* Removed destructor in ComboBoxModel.h
* Changed member set/get functions to pass by value
* Updated signal connection with newer syntax
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