#1230 introduce multithreading for parsing

[mximp]

#1230 Introduced multithreading for parsing.

Fixed thread pool is used as executor.
Synchronized Tojo implementation is provided to make Foreign catalog file access safe.

Since parsing takes not that much time overall performance gain for Fibonacci app with 4 threads constitutes 2-3 seconds.

[mximp]

@yegor256 please review

[yegor256]

@mximp maybe it's better to use this: yegor256/tojos#16

[mximp]

@mximp maybe it's better to use this: yegor256/tojos#16

@yegor256 Definitely better. Since it's not implemented yet I couldn't find it and implemented quick version on my own.
Can we create a separate task for replacement onece it's ready?

[yegor256]

@mximp sure, but let's mark your class with todo, to not forget that we should replace it

[mximp]

@yegor256 done

[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)