Update buildsystem

[hathach]

• update cmake build
• add board.cmake
• remove git submodules from uf2 version

[Copilot]

Pull request overview

This PR updates the CMake build system to improve the build infrastructure. The changes remove git submodule version tracking from the UF2 version string, add board-specific CMake configuration files for all supported boards, and clean up the build system by removing SEGGER-specific files and simplifying the toolchain configuration.

• Simplifies version string by removing git submodule information
• Adds board.cmake files for all boards to support CMake builds
• Removes unused SEGGER Embedded Studio files
• Modernizes CMake toolchain configuration and linker scripts

Reviewed changes

Copilot reviewed 67 out of 68 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/screen.c	Updates comment and references from UF2_VERSION_BASE to UF2_VERSION
src/main.c	Code cleanup: removes unused includes, adds braces for single-line if statements, reformats comments, fixes const qualifier position in assert_nrf_callback
src/boards/*/board.cmake	Adds CMake board configuration files for all supported boards specifying MCU variant
segger/*	Removes SEGGER Embedded Studio project files and RTT implementation (kept in lib/)
linker/*.ld	Comments out GROUP statements and removes excess whitespace
cmake/toolchain/arm_gcc.cmake	Simplifies toolchain setup, removes try_compile workarounds, inlines flag initialization
cmake/cpu/cortex-m4.cmake	Simplifies to focus on GCC toolchain only
cmake/toolchain/set_flags.cmake	Removed (functionality moved inline)
CMakeLists.txt	Restructures build order, removes git submodule version tracking, simplifies debug configuration, adds new flash targets
Makefile	Removes git submodule version tracking from UF2_VERSION
README.md	Removes dollar signs from shell command examples for consistency
.clang-format	Adds clang-format configuration for code formatting

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