Adding an OOP analogue for StringUtils.splitPreserveAllTokens ISSUE #1722

[tjann7]

Rationale of some decisions made:

1. Functional Interface allows use of custom String splitter function avoiding the static method calls
2. A new class created as modifying already existing Split class would not be shorter : if we add some checking for flags would create just as many constructors as with 2 distinct classes
3. Tests only compare lengths of obtained Collections

[tjann7]

@yegor256 @pnatashap do these commits satisfy requirements #1722?
Apologies for unnecessary dirt in pull request.

[yegor256]

@tjann7 maybe you can provide a more detailed explanation here, with an example? Currently, it's hard to understand what this class is for, exactly.

[tjann7]

@yegor256 please review
Also, is it okay to tag people always asking for a review or you will reach eventually on your own?

[yegor256]

@rultor merge

[rultor]

@rultor merge

@yegor256 OK, I'll try to merge now. You can check the progress of the merge here.

[rultor]

@rultor merge

@yegor256 Done! FYI, the full log is here (took me 7min).