Use multiline strings for embedded shader code
Use multiline strings for embedded shader code

This avoids "String literals should not be duplicated" issue
in SonarCloud

https://sonarcloud.io/organizations/epam/rules?open=javascript%3AS1192&rule_key=javascript%3AS1192

epam/miew,epam/miew,epam/miew,epam/miew,epam/miew