Add NuGet packages ignore
Switch to DotNetZip NuGet package
Move RS5 manipulation to separate library
Change namespace of library to LibRS5
Fix RS5Environment not writing KeyValueLists
Move RS5 directory processing from RS5-Extractor to LibRS5
Move directory read/write handling to RS5Archive
Improve central directory reading
Make RS5Archive enumerable
Add experimental write support (untested)
Switch directory sort order