Remove unused code. Update modernization plan. #39

	name: C/C++ CI

	on:
	push:
	branches: [ "master" ]
	pull_request:
	branches: [ "master" ]

	jobs:
	build:

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v4
	- name: install dependencies
	run: \|
	sudo apt update
	sudo apt install -y libncurses-dev libxmu-dev libx11-dev libxext-dev \
	libxrandr-dev libxcursor-dev libxi-dev libxss-dev
	- name: build and install SDL3
	# ubuntu-latest (24.04 as of writing) has no libsdl3-dev package; SDL3
	# only landed in Ubuntu starting with 25.04. Build the pinned stable
	# release from source instead of depending on a distro package.
	run: \|
	curl -fsSL -o /tmp/SDL3.tar.gz \
	https://github.com/libsdl-org/SDL/releases/download/release-3.4.12/SDL3-3.4.12.tar.gz
	tar -xzf /tmp/SDL3.tar.gz -C /tmp
	cmake -B /tmp/SDL3-build -S /tmp/SDL3-3.4.12 -DCMAKE_BUILD_TYPE=Release
	cmake --build /tmp/SDL3-build -j$(nproc)
	sudo cmake --install /tmp/SDL3-build
	sudo ldconfig
	- name: configure
	run: cmake -B build
	- name: build
	run: cmake --build build -j$(nproc)
	- name: test
	run: ctest --test-dir build --output-on-failure --label-exclude long

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