Add WindowContext::set_vsync to allow for runtime vsync configuration #1176

	name: build

	on:
	push:
	branches:
	- master
	- 0.*
	pull_request:
	branches:
	- master

	env:
	CARGO_TERM_COLOR: always
	RUST_BACKTRACE: 1

	jobs:
	desktop:
	runs-on: ${{ matrix.os }}
	strategy:
	matrix:
	os: [ubuntu-latest, windows-latest, macos-latest]
	rust: [stable]

	steps:
	- uses: actions/checkout@v2

	- name: Install Rust Toolchain
	uses: actions-rs/toolchain@v1
	with:
	profile: minimal
	toolchain: ${{ matrix.rust }}
	components: rustfmt, clippy
	override: true

	- name: Check
	uses: actions-rs/cargo@v1
	with:
	command: check
	args: --examples --all-features

	- name: Rustfmt
	uses: actions-rs/cargo@v1
	with:
	command: fmt
	args: -- --check

	web:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2

	- name: Install Rust Toolchain
	uses: actions-rs/toolchain@v1
	with:
	profile: minimal
	toolchain: stable
	override: true

	- name: Install wasm-pack
	run: curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf \| sh

	- name: Build examples
	run: \|
	for example in `find examples -maxdepth 1 -mindepth 1 -type d -printf "%f\n"` ; do
	if [ -f "examples/$example/Cargo.toml" ]; then
	echo "::group::Build $example example"
	pushd examples/$example
	CARGO_TARGET_DIR=../../target wasm-pack build --target web --out-name web --dev
	popd
	echo "::endgroup::"
	fi
	done

	headless:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2

	- name: Install Rust Toolchain
	uses: actions-rs/toolchain@v1
	with:
	profile: minimal
	toolchain: stable
	override: true

	- run: sudo apt-get update && sudo apt-get install -y xvfb

	- run: xvfb-run -a cargo run --example headless --features="headless"

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