Update encoding of 'details' maps (xanzy#86)

Update encoding of 'details' maps

Tweak the CustomService (xanzy#83)

Make sure the FirewallService works with old CS version (xanzy#72)

Fix the authorizeSecurityGroup[In|E]gress responses (xanzy#69)

Fix/improve xanzy#66 (xanzy#68)

Fixing it this way makes it cleaner to use/set the `usersecuritygrouplist` in clients using this, and keeps it simular in use compared to working with `serviceproviderlist` and `tags`.

Fixes xanzy#67

Fix a bug in the createSecurityGroup call (xanzy#62) (xanzy#63)

Fix a bug in the listAffinityGroup call (xanzy#61)

It reports the number of VirtualMachines in the groups as being the number of groups found.

Fix a bug that created bad parameter names (xanzy#60)

When the parameter is called `type` we have to convert this to prevent using the reserved keyword `type` as a variable name. But we were doing it in a few other locations as well. That’s fixed now.

Fix the ListLoadBalancerRuleInstances response (xanzy#59)

This one can have two possible response types, depending on the query values used. By adding this, both types are supported.

Improver helper function to retrieve ID (xanzy#58)