Better names for CallNoPayload -> Get and CallWithPayload -> Fetch

[ldemailly]

Better names for CallNoPayload -> Get and CallWithPayload -> Fetch (and thus Fetch -> FetchBytes to free up that short name)

This came up while using the API internally

[codecov]

Codecov Report

Base: 88.4% // Head: 88.4% // Increases project coverage by +0.0% 🎉

Coverage data is based on head (f576daa) compared to base (83ce661).
Patch coverage: 100.0% of modified lines in pull request are covered.

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #622   +/-   ##
======================================
  Coverage    88.4%   88.4%           
======================================
  Files          30      30           
  Lines        4309    4313    +4     
======================================
+ Hits         3810    3814    +4     
  Misses        335     335           
  Partials      164     164           

Impacted Files	Coverage Δ
jrpc/jrpcClient.go	100.0% <100.0%> (ø)

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