2.x: API removals and renames

[akarnokd]

Notable changes:

• delete concat 5-9 arguments, use concat(just(...)) or concatArray(...) instead
• delete withLatestFrom 5-8 arguments
• rename merge(Publisher...) into mergeArray(Publisher...) to disambiguate
• rename merge(int, int, Publisher...) into mergeArray(int, int, Publisher...) to disambiguate
• delete merge(int, Publisher...) overload
• rename mergeDelayError(Publisher...) into mergeArrayDelayError(Publisher...) to disambiguate
• rename mergeDelayError(int, int, Publisher...) into mergeArrayDelayError(int, int, Publisher...) to disambiguate
• delete mergeDelayError(int, Publisher...) overload
• delete takeLatestBuffer overloads

[codecov-io]

Current coverage is 69.44% (diff: 100%)

Merging #4413 into 2.x will decrease coverage by 0.11%

@@                2.x      #4413   diff @@
==========================================
  Files           454        454          
  Lines         32518      32359   -159   
  Methods           0          0          
  Messages          0          0          
  Branches       5209       5209          
==========================================
- Hits          22619      22471   -148   
+ Misses         7706       7688    -18   
- Partials       2193       2200     +7   

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[JakeWharton]

👍

[akarnokd]

/cc @zsxwing

[zsxwing]

👍 🎉