Feature request: Stick to one type of class name separator

[frankie-loves-jesus]

Noticed some inconsistencies with class name separators, ie.:

.selectize-dropdown.plugin-optgroup_columns
.selectize-control.plugin-remove_button

should probably be:

.selectize-dropdown.plugin-optgroup-columns
.selectize-control.plugin-remove-button

[joallard]

Agreed, even though it's a breaking change

[risadams]

closing stale issues older than one year.
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