(#1564) Exploit generic variance of IO package

[DmitryBarskov]

For #1564 "Exploit generic variance for package org.cactoos.io". Generify classes in org.cactoos.io package

• CheckedInput
• CheckedOutput
• InputWithFallback
• Joined
• OutputStreamTo
• ReaderOf
• TempFolder
• Zip
• To be able to generify io package I had to update IoCheckedFunc from func package as well.

Please note that there is more changes come regarding this issue.

[codecov-commenter]

Codecov Report

Merging #1647 (72e5623) into master (e9125cd) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master    #1647   +/-   ##
=========================================
  Coverage     90.10%   90.10%           
  Complexity     1612     1612           
=========================================
  Files           300      300           
  Lines          3779     3779           
  Branches        122      122           
=========================================
  Hits           3405     3405           
  Misses          340      340           
  Partials         34       34           

Impacted Files	Coverage Δ
src/main/java/org/cactoos/io/OutputStreamTo.java	35.48% <ø> (ø)
src/main/java/org/cactoos/io/ReaderOf.java	96.55% <ø> (ø)
src/main/java/org/cactoos/func/IoCheckedFunc.java	100.00% <100.00%> (ø)
src/main/java/org/cactoos/io/CheckedInput.java	83.33% <100.00%> (ø)
src/main/java/org/cactoos/io/CheckedOutput.java	83.33% <100.00%> (ø)
...rc/main/java/org/cactoos/io/InputWithFallback.java	73.33% <100.00%> (ø)
src/main/java/org/cactoos/io/Joined.java	100.00% <100.00%> (ø)
src/main/java/org/cactoos/io/TempFolder.java	100.00% <100.00%> (ø)
src/main/java/org/cactoos/io/Zip.java	100.00% <100.00%> (ø)

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[victornoel]

@0crat assign @andreoss

[victornoel]

thx @andreoss for the review, I've thus assigned you :)

[victornoel]

@0crat assign @andreoss

[victornoel]

@rultor merge

[rultor]

@rultor merge

@victornoel OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor merge

@victornoel Done! FYI, the full log is here (took me 12min)

[0crat]

Code review was too long (106 days), architects (@victornoel) were penalized, see §55

[0crat]

@sereshqua/z please review this job completed by @andreoss/z, as in §30; the job will be fully closed and all payments will be made when the quality review is completed