CSFloat API fix, more bugfixes

Note: This updates no longer has a .NET 6.0 build, so you have to make sure to have .NET 7.0 installed.

What's Changed

• About window which contains links to source code, license, tutorial, discord server and more
• Fixed some logging messages for better understanding in case of a problem
• Fixed ItemsParser to exclude duplicated items
• Made a fix for changing domain name
• Fixed issues with CSGOFloat (now CSFloat). Float fetching should work fine
• "Craft Range" value now updates to show actual range from loaded items
• Fixed short CPU name for new processors
• Bump DiscordRichPresence from 1.1.4.20 to 1.2.1.24 by @dependabot in #22

Full Changelog: v.1.4.1...v.1.5.0