Upgrade to .net core 3.1, added feeds

Upgrade to .net core 3.1, added feeds

Update dependencies

Set .net core version to 2.1 since 2.2 end of support.

File checksum Geonorge.massiv.nedlasting-0.9.193.msi:
MD5 : 44bc4111fe65a8ba88f81f8a4f35ebfb
SHA-1 : edac7d08764a9272ea74cd9d885d50f404586018

Bugfixes

Check for url changes in feed.
Null reference check formats.
Added Atom Feed from NGU

Bugfix

Bugfix for new dataset available

Bugfixes

Create temporary file when downloading to better handle partial downloads
Fix for updated dataset available
++

Update dependencies

Upgraded to .net core 2.2

Subscribe to selected projections within a dataset

• You can now subscribe to selected projections within a dataset
  

Bug fix

• Fixed bug regarding downloading large amounts of files. After a while it lead to response message "Bad Request".

Bug fix

• Fixed bug regarding expanded datasets in download list.
• Fix bug in process of converting download.json to default.json, when multiple configuration files are present.
• Update property "LastUpdated" in downloadHistory.json if download was successful

v0.9.140

Update nuget RestSharp