Add version checking between components

[teon]

Since we have 4 major components: core/proxy/gw/client we need a way to verify if the component communicating is within required version.

[ ] Each component checking needs to return an error (if there is) with version required for that component [ ] That component as well as the component that got the error needs to log that error in logs [ ] The client needs to display a modal with the error [ ] Core needs to check version of proxy, gw & client [ ] Client needs to check version of proxy when adding instance [ ] Proxy needs to check version of core [ ] GW needs to check version of core