Split HTML and CSS to a "Style" file

Separated HTML and CSS from vCheck.ps1 to Style.ps1
Added "$style=Default" to GlobalVariables.ps1
Modified Plugins/00 1st Plugin - Select Report Header Image.ps1 to work with new Styles folder structure
Add /Styles folder
Add /Styles/Default folder
Add /Styles/Default/Style.ps1 and Header.jpg
Add /Styles/CleanGreen folder
Add /Styles/CleanGreen/Style.ps1 and Header.jpg