Release v1.12.2.0

Release v1.12.2

• #1887 QOL request: batch files together into fewer signtool invocations
• ProjectFileSigner is extended to support batch signing for all files, not just embedded assemblies only.

courtesy of @dand-oss

• Added: FileAssociation.IconFile property for auto-registering icon files
  When IconFile is set to a path, WixSharp automatically registers an Icon element and uses its ID for the file association.
  This simplifies icon setup for non-advertised file associations where the Icon attribute must be an Icon Id rather than a file path.
• Added: InstalledFileAction resolves file key by name if ID not found
  When the Key property doesn't match an exact file ID, WixSharp now searches for a file by name (case-insensitive) and uses its ID.
  This allows using simple filenames like "MyApp.exe" instead of having to specify the WiX-generated file ID.
  If multiple files match the name, an exception is thrown with a clear error message listing the matching files.