Misc Updates and favicon fixes (#5993)

- Updated crates
- Switched to rustls instead of native-tls
  Some dependency were already using rustls by default or without option.
  By removing native-tls we also have just one way of working here.

Updated favicon fetching which now is able to fetch more icons.
- Use rustls instead of native-tls
  This seems to work better, probably because of tls sniffing
- Use different user-agent and added several other headers
- Added SVG support. SVG Images will be sanitized first before stored or presented.
  Also, a special CSP for images will be sent to prevent scripts etc.. from SVG images.

Signed-off-by: BlackDex <black.dex@gmail.com>

rust-toolchain.toml

@@ -1,4 +1,4 @@
 [toolchain]
-channel = "1.87.0"
+channel = "1.88.0"
 components = [ "rustfmt", "clippy" ]
 profile = "minimal"