Implement simple installer based on [go-bindata:https://github.com/jteeuwen/go-bindata].
It would do simple thing similar to other self-extracting installers, unpack specific Asset from executable and run it.

In case of windows installer it would speedup installation. because instead of extracting everything for bundle installer as 7Zip does, it would pull only installer first and run it. Then every specific installer selected for installation would first pull data out of installer executable with go-bindata.

This approach would fix several opened issues that should be addressed upstream in 7Zip selexecuatble.