Optimize DNA (and DNA complement) rendering

[#47148973]

It became time consuming after support for dynamic changes of DNA (for
insertion mutation). The main optimization is connected with shifting
whole containers of junk and terminator sequences instead of defining
them again with different starting position.
Implement deletion mutation in genetic engine

[#47148955]
Animate process of nucleotides deletion

[#47148955]
Update mutations context menu (add deletion mutation)

[#47148955]