add optional param to _is_hwpi_theme() #3848
add form submit to change breadcrumbs for hwpi themes #3848
modify CP > Settings form for breadcrumbs, add text #3848
also set default breadcrumb OFF when switching to non-hwpi theme #3848
Merge pull request #4042 from openscholar/3848-breadcrumbs3

When an HWPI theme is enabled, enable breadcrumbs