Implement scene management; various fixes and improvements #91

	name: Build

	on: [push, pull_request]

	jobs:
	build:
	runs-on: ubuntu-latest
	timeout-minutes: 20
	steps:
	- name: Checkout
	uses: actions/checkout@v3
	- name: Install ninja
	run: sudo apt install ninja-build
	- name: Install Python
	uses: actions/setup-python@v4
	with:
	python-version: "3.10"
	- name: Configure G++ version
	run: \|
	sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-12 10
	sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-12 10
	sudo update-alternatives --set gcc "/usr/bin/gcc-12"
	sudo update-alternatives --set g++ "/usr/bin/g++-12"
	- name: Display G++ version
	run: g++ --version
	- name: Configure ninja
	run: ./configure.py
	- name: Compile
	run: ninja
	- name: Upload result
	uses: actions/upload-artifact@v3
	with:
	name: Kinoko
	path: out

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