ios12checker/Windows-Maintenance-Tool v5.3 on GitHub

Added launcher self-update checks in Start_WMT_GUI.bat (downloads latest launcher script when a newer launcher version is detected).
Added GUI script auto-update checks in Start_WMT_GUI.bat by comparing local and remote $AppVersion.
Added clearer launcher failure handling dialogs for missing script download and declined admin elevation.
Added /data/ to .gitignore.

Updated Start_WMT_GUI.bat from launcher v1.2 to v1.3.
Updated startup flow in launcher:
- checks launcher update,
- checks GUI script update,
- validates script is not HTML,
- then elevates and starts WMT-GUI.ps1.
Updated WMT-GUI.ps1 app version to 5.3.
Switched PowerShell console output encoding setup from fixed UTF-8 to locale-aware OEM code page handling.
Reworked WinGet scan/search parsing logic to better handle variable column layouts and source column presence/absence.

Fixed launcher startup problems in paths containing spaces/parentheses (for example Program Files (x86)).
Fixed admin elevation robustness from the launcher batch flow.
Fixed WinRE status parsing reliability on localized Windows installs.
Fixed WinRE command output encoding handling for non-English environments.
Fixed WinGet list/search row parsing stability (reduces column/value mismatch cases).