**[AOSS-1083] Data-table updates and sidebar variants**
**[AOSS-1083] Data-table updates and sidebar variants**

[Includes removal of service and/or page specific naming refactor]

 - *Data-table redesign*:
   - migrates data-table style rules to _datatables module css
   - search field + label positioning aligned left and stacked
   - 4th column head cell sort icon positioning - adjusted for narrower column
   - variant table row classes with bkg colors added for contrasting + event highlighting

 - *Sidebar redesign*:
   - full-width list variant
   - list-item 3px indent variant (details / summary icon)

 Other:
  - remove "page/_client-list" and "modules/_client-list"
  - remove redundant data-table related checkbox and controlpanel rules
  - add global breadcrumb variant to remove bottom border
  - remove missing-client form error styles
    - replaced by modules/form/errors.css classes
    - update ajax callback with modules/form/errors.css classes

hmrc/assets-frontend,hmrc/assets-frontend,hmrc/assets-frontend