Add versioning support with build date and git commit hash

[ajlennon]

Summary

This PR adds comprehensive versioning support to the CGA Coordinate Mapping application.

Changes

• Added version properties to InstDotNet.csproj (Version, AssemblyVersion, FileVersion)
• Created VersionInfo.cs class to expose version information at runtime
• Added MSBuild target to automatically capture:
  • Build date/time in UTC format
  • Git commit hash (short format)
• Embedded build metadata as assembly metadata attributes
• Updated Program.cs to display version information on application startup

Version Format

The application now displays version information in the following format:

CGA Coordinate Mapping - Version X.Y.Z (Build: YYYY-MM-DD HH:mm:ss UTC, Commit: <hash>)

Example Output

CGA Coordinate Mapping - Version 1.0.0 (Build: 2025-11-20 16:01:06 UTC, Commit: 8b75ff0)

Benefits

• Easy identification of deployed versions
• Traceability to specific git commits
• Build timestamp for debugging and support
• Automatic capture during build process (no manual updates required)

Testing

• ✅ Build succeeds with version metadata
• ✅ Version information displays correctly on startup
• ✅ Build date and git commit hash are captured automatically
• ✅ Works in both local builds and CI environments

Reviewer

@Jen42 - Please review this PR when you have a chance.