Sector Size lookups for GPT Disks

The new GPT parsing facility that was made available when right clicking a disk was originally hard coded to expect a sector size of 512 bytes, but with some disks, increasingly, the sector size can be bigger, such as 2Kb or 4Kb. This pre-release test version should in theory detect the sector size and the functions are then adjusted accordingly.

I don't have a disk with such large sector sizes so testing is appreciated by anyone who does.

This is for the Windows version only, because technical disk specification are called via Linux itself on the Linux version. Nevertheless, other minor improvements have been incorporated into this pre-release, so Linux version supplied too.