Remove dependency on Rcompression

[Jeroen Ooms]

Hello! I see you recently introduced a dependency on the non-cran package Rcompression. However this package is unmaintained and it does not build on recent operating systems. Therefore also RSelinium can no longer be built on these systems.

From the code, it looks like you only use it to create zip files. Perhaps a maintained CRAN package like zip or archive can be a replacement?

Thank you!