Use private fields

[tshemsedinov]

We have decided to use private fields in vintaxis with #. Here is a list of repositories to be reviewed:

• https://github.com/metarhia/metacalc
• https://github.com/metarhia/metautil
• https://github.com/metarhia/metasql
• https://github.com/metarhia/metaconfiguration
• https://github.com/metarhia/metadomain
• https://github.com/metarhia/metalog
• https://github.com/metarhia/concolor
• https://github.com/metarhia/noroutine
• https://github.com/metarhia/lowscript
• https://github.com/metarhia/metawatch
• https://github.com/metarhia/metavm

Please don't create pull requests immediately. First step: review all codebase and collect links to the certain places and post all links to this issue. Second step: we will discuss all those cases and assign you to make PRs.