MDL-40337 use class loader for admin/roles/*
MDL-40337 cleanup admin select UI
MDL-40337 cleanup role allow pages
MDL-40337 cleanup role assign pages
MDL-40337 cleanup role definition code
MDL-40337 cleanup role manage UI
MDL-40337 cleanup role override code
MDL-40337 cleanup role permissions code
MDL-40337 cleanup users roles code
MDL-40337 fix remaining code checker troubles in admin/roles/*
MDL-40337 use full frankenstyle in get_string() calls
MDL-40337 fix some more deprecated calls in role code