[tabs] Adds missing methods

_set_active_panel, _get_hash
Merge pull request #2312 from berubs/issue2295

[tabs] Adds missing methods
Removed unnecessary padding property for external icons from Grids SCSS.
Merge pull request #2316 from EricDunsworth/v3.0-grids-icon-external-padding

Removed unnecessary padding property for external icons from Grids SCSS.
Merge branch 'v3.0'