Feature/23 naming defaults

[andures]

Summary

Adjusts the output naming defaults to use RWYXX when a runway field is missing.
Normalizes runway identifiers to a consistent format RWYNN with leading zero and optional suffix L/R/C (e.g., RWY01, RWY09L).
Keeps the previously added “Output name (optional)” behavior: user input is concatenated with the selected facility label; if absent, the normalized runway remark is used.
Changes

Default remark and normalization helper added in ils_llz_dockwidget.py
Default to RWYXX when no runway field is present.
Parse and normalize runway values found in typical fields (runway, rwy, thr_rwy) to RWYNN with optional L/R/C.
Behavior

When a runway value exists: RWYNN(+L/R/C) is used and concatenated with the facility label for display names.
When missing: RWYXX is used and concatenated with the facility label.
The UI “Output name (optional)” still overrides the base name if provided.
Verification

In QGIS ≥ 3.0:
Select a navaid without runway field → Calculate → Layer name should include RWYXX - BRA_areas.
Select a navaid with runway like 9, 09L, or RWY9R → Calculate → Layer name should include RWY09, RWY09L, RWY09R respectively.
Enter a custom Output name → Calculate → Layer name should include - BRA_areas.
Linked Issue

Closes #23 #22