Rename enqueue/dequeue to add/poll

[sharwell]

Fixes #35

[codecov]

Codecov Report

Merging #37 into master will increase coverage by 0.02%.
The diff coverage is 92.59%.

@@             Coverage Diff              @@
##             master      #37      +/-   ##
============================================
+ Coverage     76.95%   76.97%   +0.02%     
- Complexity      839      840       +1     
============================================
  Files            32       32              
  Lines          4952     4952              
  Branches        646      646              
============================================
+ Hits           3811     3812       +1     
  Misses          891      891              
+ Partials        250      249       -1

Impacted Files	Coverage Δ
src/com/tvl/util/ImmutableLinkedQueue.java	96.77% <100%> (ø)	✅
test/com/tvl/util/ImmutableLinkedQueueTest.java	85.71% <91.66%> (ø)	✅
test/com/tvl/util/ImmutableListTest.java	81.94% <0%> (+0.2%)	✅

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