Migration to Iced 0.10

[GyulyVGC]

This PR migrates Sniffnet to Iced 0.10, fixing associated changes and introducing new features available:

• Now the graphical renderer is chosen at runtime and a fallback one (tiny-skia) will be used if the default one (wgpu) crashes
• Added option to set different types of color gradients for each of the available themes
• Improved tabs and modals layout using the new BorderRadius capabilities, that allow to specify a different radius for each of the angles
• Changed scrollable style to make scrollable render properly also with tiny-skia
• Unfortunately, Persian translation has been removed since RTL languages are unsupported and may crash the app

[GyulyVGC]

@4r7if3x hey man!

Iced has finally published the release featuring a new software renderer as well as font fallback.

• Negative news first:
  Unfortunately, I had to comment (80a8871) Persian since the situation for RTL languages got even worse actually (can cause panic in some circumstances and are completely messed up, Crash with Arabic text in PickList iced-rs/iced#1981)
• On the bright side:
  Now a CPU-only renderer based on tiny-skia is available and is claimed to run "everywhere"; glow has been removed and by default wgpu is still uses, and tiny-skia is used as a fall-back in case of wgpu problems.
  tiny-skia is a bit slow in debug mode but works great on my hardware in release mode.
  IIRC, you said you had a PC which doesn't support wgpu. Can you confirm it correctly displays everything with tiny-skia?
  To note that tiny-skia can also be tested by disabling iced default features (that include wgpu)