C make migration

[jolavillette]

Works together with RetroShare pr/3226

Update: whole project now migrated to CMake

This PR works out of the box on Ubuntu

CMake Build System Migration
This branch introduces a comprehensive migration of the RetroShare build system from QMake to CMake. The goal is to provide a more modern, maintainable, and standard build process for the entire project.

Accomplishments:

• Core Components Support: Implemented full CMake support for libretroshare, retroshare-gui, and retroshare-service.
• Dynamic Versioning: Restored and improved the automatic versioning system. The build now dynamically extracts version components (Major, Minor, Mini, Extra) from Git tags for the root project and correctly handles the Git hash for the libretroshare submodule.
• AutoUic Fixes: Resolved complex build issues related to cross-module UI inclusions (notably in GXS components) by implementing robust AUTOUIC_SEARCH_PATHS.
• Standardized Configuration: Centralized project options and dependencies in the root CMakeLists.txt, making it easier to manage build-time features (GXS, BitDHT, etc.).
• Cross-Platform Readiness: Structure prepared for improved cross-platform support and faster build times using Ninja and modern CMake practices.

Current Status & Caveats:

• Plugins: Migration of the plugin system to CMake is not yet implemented. Plugins are currently excluded from this build system.
• Validation: The build has been fully tested and validated on Ubuntu with default options (no additional flags). Not tested on macOS.

[G10h4ck]

A big NO from my side, I have saw a few good lines in the PR. But all the rest is messing up all the work I previously made. Basically destroying build time configuration.

[G10h4ck]

I am a bit surprised this is appended unconditionally, shouldn't this be included only when friendserver is enabled?

[G10h4ck]

I am a bit surprised this is appended unconditionally, shouldn't this be included only when friendserver is enabled?

[jolavillette]

Closed in favor of a modular cmake implementation
see #298