Combine zoom hashes into single hash using base64 encoding

[jamessspanggg]

After this PR, can you put up an issue to combine all the zoom hashes into a single hashes using base64 encoding?
This is to centralize the use of aliases, to limit the appearance of e.g. zU in our code

Originally posted by @eugenepeh in link

With #830 merged, quite a number of zoom hashes are used to restore the zoom tab after reloading. Let's combine them to a single hash using base64 encoding.

[jamessspanggg]

@eugenepeh should we do the same for summary as well as authorship? the hash params for these views are increasing as well

[eugenepeh]

@eugenepeh should we do the same for summary as well as authorship? the hash params for these views are increasing as well

Yes ideally all should be combined into a single base64 encoding, which would then be pre and post processed on every save/reload.