[#217] Replace remaining GPL headers with SPDX headers

[vbmacher]

No description provided.

[Copilot]

Pull Request Overview

This PR replaces remaining GPL license headers with SPDX headers across various plugin files and the main application. The change follows SPDX (Software Package Data Exchange) standards for license identification, making copyright and licensing information more machine-readable and concise.

• Updates version.properties files in multiple plugin modules
• Replaces multi-line GPL headers with compact SPDX format headers
• Updates grammar files (.g4) and build scripts with SPDX headers

Reviewed Changes

Copilot reviewed 44 out of 44 changed files in this pull request and generated no comments.

File	Description
44 version.properties files	Replace GPL headers with SPDX headers for copyright and license identification
1 build.gradle file	Update license header to SPDX format
10 grammar files (.g4)	Replace GPL headers with SPDX copyright format
4 CPU definition files (.eds)	Update license headers to SPDX format

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