Reuse some code in netutil for fetching stream (provide useragent for
all uses)
make sav4ranch use dynamicly read offsets to handle both variants
(quicker) #2248
* Put assembly version in window title
* Treat version.txt as a Version
* Cache current version
* Don't use resources anymore for version
* Re-add version.txt, for backwards compatibility
* Set old version.txt's build action to None
* Use GitHub API for version checking
Move System.Drawing usage out of Core to WinForms, as System.Drawing is
not in .NET Core/Standard. Simple methods to return resource name
strings have been added instead.
