[ISSUE #180][BUILD] CMake failure with QT < 5.15.0

[svlad-90]

[ISSUE #180][BUILD] CMake failure with QT < 5.15.0

1. [X] Have you followed the guidelines in our Contributing document?
2. [X] Have you checked to ensure there aren't other open Pull Requests for the same update/change?
3. [] Have you built the project, and performed manual testing of your functionality for all supported platforms - Linux and Windows? Checked on Ubuntu only.
4. [X] Is your change backward-compatible with the previous version of the plugin?

Change description:

• Added glue code to call compatible qt CMake commands in case of Qt version < 5.15.0

Verification criteria:

• Checked manually on Ubuntu OS