Create constraint system#56

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MrsSima wants to merge 2 commits intoyurii-litvinov:masterfrom

MrsSima:darya-merge2

Commits on Apr 5, 2018

Added model to plugin configuration, to be able to actually do something from plugins.

yurii-litvinov
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MrsSima
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Commits on Mar 17, 2019

Create constraint system
MrsSima
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