Obsługa sesji użytkownika i refactoring#10

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ScriptyChris wants to merge 9 commits intomasterfrom

feature/handle-user-session

Commits on Jul 18, 2021

Separate Http, WebSocket and variable constants to modules; Refactor code to use classes;
ScriptyChris
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Fix issues with not responding Http server;
ScriptyChris
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Prepare to match connected users by session - get their session cookie and id from database;
ScriptyChris
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Commits on Jul 21, 2021

Move matching socket's client group from HttpServer class to WebSocket class;
ScriptyChris
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Commits on Jul 22, 2021

Fix tests;
ScriptyChris
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