Migrate build system to GNU Autotools; remove SCons and CMake support

[KaliAssistant]

Summary

This PR removes support for building the project with SCons and CMake, and introduces a full GNU Autotools build system. This simplifies build toolchain support and aligns better with standard packaging systems.

Changes

• Removed:

  • CMakeLists.txt and all CMake-related files
  • SConstruct, SConscript, version.py, linux.py, and other SCons-related files
  • version.h.in, version, and related CMake-generated version headers
  • Legacy .pc.in file for CMake

• Added:

  • Autotools files: configure.ac, Makefile.am, src/Makefile.am, autogen.sh
  • libws2811.pc.in moved and adapted for Autotools in src/

• Updated:

  • .gitignore to ignore Autotools-generated files (e.g. configure, Makefile.in, autom4te.cache/, etc.)
  • All source and header files moved into src/ directory to align with Automake structure

Build Instructions

To build using Autotools:

./autogen.sh && ./configure && make

for cross-build:

./configure --host=aarch64-linux-gnu --disable-debug --disable-test --enable-shared=yes

Optional:

make install

make install DESTDIR=/path/to/root

Use ./configure --disable-test to skip building the test binary, or --disable-shared to build only static library.

Motivation

• Simplifies the build process by using a single standardized system
• Makes it easier to integrate with Debian packaging tools
• Enables standard make, make install, make dist flows
• Reduces duplication and maintenance burden across build systems

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