implement PSScriptAnalyzer suggestions, add PSCodeCode health report to GitHub

[iricigor]

In total there are about 40 warnings, and more than half should be easy to remove.

Invoke-ScriptAnalyzer -path . -Recurse  | group message | Select Count, Name | Sort Count -Descending

Count Name
----- ----
   10 '%' is an alias of 'ForEach-Object'. Alias can introduce possible problems and make scripts hard to maintain. Please consider changing alias to its full content.
    8 'cd' is an alias of 'Set-Location'. Alias can introduce possible problems and make scripts hard to maintain. Please consider changing alias to its full content.
    7 File 'EasyAzureFunction.psm1' uses Write-Host. Avoid using Write-Host because it might not work in all hosts, does not work when there is no host, and (prior to PS 5.0) cannot be suppressed, captured, or redirected. Instead, use Write-Output, Write-Verbose, or ...
    6 'Select' is an alias of 'Select-Object'. Alias can introduce possible problems and make scripts hard to maintain. Please consider changing alias to its full content.
    4 '?' is an alias of 'Where-Object'. Alias can introduce possible problems and make scripts hard to maintain. Please consider changing alias to its full content.
    1 Function 'New-AzureFunctionCode' has verb that could change system state. Therefore, the function has to support 'ShouldProcess'.
    1 File 'EasyAzureFunction.Module.Tests.ps1' uses Write-Host. Avoid using Write-Host because it might not work in all hosts, does not work when there is no host, and (prior to PS 5.0) cannot be suppressed, captured, or redirected. Instead, use Write-Output, Write-...
    1 Do not use wildcard or $null in this field. Explicitly specify a list for AliasesToExport.
    1 Invoke-Expression is used. Please remove Invoke-Expression from script and find other options instead.
    1 Do not use wildcard or $null in this field. Explicitly specify a list for FunctionsToExport.

Invoke-ScriptAnalyzer -path . -Recurse  | group scriptname | Select Count, Name | Sort Count -Descending

Count Name
----- ----
   16 run.ps1
    7 EasyAzureFunction.psm1
    3 Convert-ParametersToHTML.ps1
    3 Get-Parameter.ps1
    2 New-AzureFunctionCode.Tests.ps1
    2 Get-Parameter.Tests.ps1
    2 EasyAzureFunction.psd1
    2 Convert-ParametersToRunner.ps1
    1 EasyAzureFunction.Module.Tests.ps1
    1 CreateExamples.ps1
    1 New-AzureFunctionCode.ps1