2.3.1

This is a small release mainly to fix a bug reported by @lahm86 where trview wouldn't open again if closed when minimised.

Bug Fixes:
#1048 Existing filters/order are not applied after switching levels
#1051 Launching trview fails if last closed when minimized
#1057 Title.trc and richcut2.trc freeze trview when you try to open them

Documentation:
#1060 Create version 2.3.1

What's Changed

• Sort window lists on initialisation by @chreden in #1049
• Always use SW_SHOW when restoring window location by @chreden in #1054
• Add missing include files for latest VS by @chreden in #1055
• Update to latest version of DirectTK by @chreden in #1056
• Stop reading sound samples by @chreden in #1058
• Move interface destructors to implementation by @chreden in #1059
• Create version 2.3.1 by @chreden in #1061

Full Changelog: v2.3.0...v2.3.1