Style cleanup - Round 1

- Pushed style variables from GlobalVariables.ps1 to style.ps1 (for all default styles)
- Tweaked VMware style
   * Moved to CSS classes to remove duplicated code in report
   * Centered report, looked a bit funny squished to the left I thought.
- $TimeToRun variable now actually does something!
- Moved HeaderImg to vCheck and removed plugin - have some plans to work on image handling to give us the ability to embed images in reports.
- vCheck.ps1 updated to new Get-HTMLList function for "List" display style. Replaces Get-HTMLDetail

Still a little bit to do, but this is a good start. Will cleanup some of the other styles at some point