Initial Karlsen Network Support

[lemois-1337]

This PR is work-in-progress (WIP) and will add Karlsen Network support into non-custodial mobile wallet for Android and iOS for the Karlsen BlockDAG. Notable changes as of now:

• Updated API endpoint https://api.karlsencoin.com
• Updated API link to fetch price information from CoinGecko
• Updated kMaxKarlsen and set it to 4961000000
• Updated website to https://karlsium.io
• Added EULA and Privacy Policy links (will become available prior to release)
• Added own dbKey to not interfere with Kaspa
• Added unique UUID to not interfere with Kaspa
• Removed the rest of unused Vite code as Kaspium is a fork of Vite mobile wallet
• Removed all unused themes: CARBON, THORIUM, NEPTUNIUM, INDIUM, TITANIUM, NATRIUM, VITERIUM, SAPPHIRIUM and PILLIUM
• Added Karlsen Network iconset
• Aligned naming of kls_icon_widget with assets/karlsen_icon.png, simplifies forks for others :)
• Updated gRPC from karlsend for dart

The gRPC code is still WIP as my dart version was incompatible with required flutter :) Will be fixed in a later commit.

[lemois-1337]

Once this is merged there will be another PR to support old Kaspa derivation path 111111.