iris

some major improvements to the (server-side) cache middleware and an example of a client-side responsibility cache

no need to default the Configuration.RemoteAddrHeaders to a list of 'dissalowed' header names, the `ctx.RemoteAddr()` made unnecessary checks if no X-header was passed, even if they defaulted to false, this will not give a crazy improvement but it's a good practise

add vscode extension link and badge | Some internal improvements (not completed yet)