Include event for new subs

[countvonzero]

• merged new subscription processing with old ones. also record events for new subscriptions in the current block
• simplify imports. use package names when there's no conflicts
• rename store/subscriptions.go to store/transfer_processor.go so it doesn't confuse with store/subscription package

[codecov-io]

Codecov Report

Merging #31 into develop will decrease coverage by 0.31%. The diff coverage is 73.61%.

@@             Coverage Diff             @@
##           develop      #31      +/-   ##
===========================================
- Coverage    44.03%   43.72%   -0.32%     
===========================================
  Files           20       20              
  Lines         1928     1887      -41     
===========================================
- Hits           849      825      -24     
+ Misses        1010      997      -13     
+ Partials        69       65       -4

Impacted Files	Coverage Δ
store/subscription/subscription.go	77.27% <100%> (ø)	:arrow_up:
store/store.go	70.46% <100%> (+2.56%)	:arrow_up:
store/transfer_processor.go	71.52% <71.52%> (ø)

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