Add missing <cstdio> includes #156

	# This is a basic workflow to help you get started with Actions

	name: Windows Unit Testing

	# Controls when the action will run. Triggers the workflow on push or pull request
	# events but only for the master branch
	on:
	push:
	branches:
	- "*"
	pull_request:
	branches:
	- "*"

	# A workflow run is made up of one or more jobs that can run sequentially or in parallel
	jobs:
	# This workflow contains a single job called "build"
	build:
	# The type of runner that the job will run on
	runs-on: windows-latest

	# Steps represent a sequence of tasks that will be executed as part of the job
	steps:
	# Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
	- uses: actions/checkout@v2
	with:
	submodules: true

	- name: Set up Python
	uses: actions/setup-python@v1
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install platformio
	- name: Run PlatformIO to fetch libraries for Bluepill
	run: \|
	cd ${{ github.workspace }}/c6021light
	platformio lib -e bluepill install

	# Runs a single command using the runners shell
	- uses: lukka/[email protected]
	with:
	cmakeGenerator: VS16Win64
	cmakeListsOrSettingsJson: CMakeListsTxtBasic
	cmakeListsTxtPath: ${{ github.workspace }}/c6021light/CMakeLists.txt
	cmakeBuildType: Release
	buildDirectory: ${{ runner.temp }}/c6021light/build
	buildWithCMake: true


	# Actual testing happening
	- name: Examine Output
	run: dir ${{ runner.temp }}\c6021light\build\

	# Actual testing happening
	- name: Run Unittest
	run: ${{ runner.temp }}\c6021light\build\Release\c6021lightTest.exe

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