Blender Git Loki

Add sequencer transform tests

Tests files are based on test from D8393

Test files should be in `libtestssequence_editing`
These are files, I will add few more tests including animation test.
{F9155273}

Using generic tool to compare rendered vs reference image as other render engines.

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D9394