Support for getting elements from within iFrames

[Badgerati]

When elements are contained within an iframe, Get-MonocleElement fails to find the element. In order for Selenium to find these elements, we need to switch context to the iframe.

To do this a new Enter-MonocleFrame will be created, this will switch the Selenium context to the iframe, run a script, and then exit the context back to the parent frame:

Get-MonocleElement -Id 'form-frame' | Enter-MonocleFrame -ScriptBlock {
    Get-MonocleElement -Id 'element-in-iframe'
    #etc
}