Add speculative typing latency parameter

[Art Pinch (ARTI1208)]

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Codecov Report

Merging #77 (74670d5) into master (c5b949d) will not change coverage.
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❗ Current head 74670d5 differs from pull request most recent head 9a34a14. Consider uploading reports for the commit 9a34a14 to get more accurate results

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  Complexity       63       63           
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  Files           132      132           
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  Branches        407      407           
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  Hits            981      981           
  Misses         2891     2891           
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[Sergei Bulgakov (SerVB)]

Could you please also remind why can it be useful to set it to non-zero? I would also suggest to mention it in the Web Client README in the table of parameters.

[Art Pinch (ARTI1208)]

It allows simpler debugging speculative typing - you can see speculative symbols longer. Another PR also allows to remove main canvas until speculative symbols are really rendered so only speculative symbols are shown. But PR 76 requires refactoring and some fixes, have no time to do this right now. Also README contains new parameter description