Fixes #[issue_no]

Summary of Changes

• Don't show terminal waypoints on the EFIS WPT overlay when in enroute ranges.
• Do show TO WPT, flight plan waypoints either side of lateral discontinuities, and at the boundary between departure/arrival/enroute.
• Fix type errors in EfisSymbols and enable strict mode.

Screenshots (if necessary)

NZCH.RW02 GUTBU2P.GRETA Y393 WARDS WARD6A UMAGA.ILS34.NZWN
GRETA and WARDS are either side of a discontinuity in the first pic, and the enroute boundaries in the second pic...
Before:

After:

References

Additional context

Discord username (if different from GitHub):

Testing instructions

Either plane is fine.
Enter a flightplan in stages, and check in PLAN mode with range at 160 or 320 that the waypoints either side of discontinuities are shown on the ND, and at the boundary between the departure and enroute, and arrival and enroute are shown when completed. Takeoff with the ND on 160 NM range in ARC mode and make sure the TO WPT (top right of ND) is always shown on the ND map.

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