(#1567) Generify `org.cactoos.proc` package

[DmitryBarskov]

For #1567:

Generify incoming parameters (use ? super T) for next classes:

• ProcOf, ProcEnvelope and FuncOf
• ProcNoNulls
• BiProcOf and BiProcEnvelope
• BiProcNoNulls
• RepeatedProc and Repeated

[victornoel]

@andreoss the fact we are going package by package is because in the past we created one todo per package. All in all, I think it's not so bad, at least it makes it easier to review (apparently not enough because it took the two of us to detect flaws in this PR ^^) since we have to check the whole class during review, not only the changes themselves :)

[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 8min)

[victornoel]

@0crat status

[0crat]

@0crat status (here)

@victornoel This is what I know about this job in C63314D6Z, as in §32:

• The job #1608 is in scope for 1mon
• The role is REV
• The job is assigned to @andreoss/z for 1mon
• There is no monetary reward attached, it's a free job
• The job doesn't have any impediments
• The budget is 15 minutes/points
• These users are banned and won't be assigned:
  • @dmitrybarskov/z: This user reported the ticket
• Job footprint (restricted area)

[0crat]

@andreoss/z resigned from #1608, since the job is not in scope anymore