Do not throw error for MO2's Invalidation.bsa on Distant Land

[rfuzzo]

Do not throw error popup for MO2's Invalidation.bsa on Distant Land. Recent MO2 creates an invalid Morrowind - Invalidation.bsa file by default, MGE Gui can't read that and throws a scary error.

This PR simply "fixes" this by silently skipping parsing for that file name. Better solutions are welcome :D

Also:

• Update slimDX link to a working website since the current one is offline
• Update .NET framework from out-of-support 4.5.2 to 4.8