* Add FLEX pager support
- Introduced a new FLEX configuration function in baseband_api.
- Added FLEX application view and associated UI elements.
- Implemented FLEX processing logic in proc_flex, including demodulation and message handling.
- Updated CMakeLists to include new FLEX source files and headers.
- Enhanced message system to support FLEX-specific messages and statistics.
This commit lays the groundwork for FLEX pager functionality, allowing for the reception and processing of FLEX messages.
* Fixed baseband and moved app to external with some other fixes.
* Format code
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Co-authored-by: RocketGod <57732082+RocketGod-git@users.noreply.github.com>