Ilsgateway integration

@czue I moved changes from ilsgateway-products-integration to this branch and I added webusers integration. I will be pushing all integrations with ilsgateway in this branch.  Is it ok? I assume that you don't want to merge this changes until it will be completely done?
@gcapalbo if we rename the signal to `commtrack_sms_received` or something does that seem like a reasonable thing? this is a little different use case than having a custom handler given the need for both levels of processing