Enable Narrow and Lite regions for EU

[NomDeTom]

Some new presets for a wider range of operations in the EU, based on #9038 but with improvements to the position and telemetry scaling implementation.

Relies on meshtastic/protobufs#824 for protobufs (as before)

What has changed?

• 2 new region presets
  • EU_866,
  • NARROW_868,
• 4 new modem presets
  • LITE_FAST/SLOW,
  • NARROW_FAST/SLOW
• new region parameters that make use of default slots, etc.

What is needed to integrate these changes more widely

• BaseUI / InkHud
  • The new regions and presets have been added to the menu lists, but the list logic has not been updated to exclude invalid combinations
• MUI
  • The new regions and presets need to be added to the menu lists, and the list logic included.
• Client Apps
  • These will need updating to take account of the valid region/preset combinations, ideally hiding invalid combinations within the menus
  • Their display logic will need updating to include the new overrideSlots information, which will affect both the lora config menu and the behaviour when new primary channels are generated

Acknowledgements

This change has been supported extensively by @Stary2001, @phaseloop, and @caveman99. Their input cannot be understated.

🤝 Attestations

• I have tested that my proposed changes behave as described.
• I have tested that my proposed changes do not cause any obvious regressions on the following devices:
  • Heltec (Lora32) V3
  • LilyGo T-Deck
  • LilyGo T-Beam
  • RAK WisBlock 4631
  • Seeed Studio T-1000E tracker card
  • Other (please specify below)

[NomDeTom]

oops - forgot to put the modem settings in!