Release v0.7.18

Added --col-width variable to col.
Created col-fixed.
Fixed search-box border.
Fixed search animation.
Added search sizes.
Reverted card-border-radius.
Fixed popover selection.
Fixed focus on all inputs inside button-group.
Changed progress-bar to use css variables.
Simplified progress-bar content.
Added progress-bar aria attributes.
Added progress-bar types.
Fixed progress-bar-content colors.
Restored default gray.