Fixes to new style functionality

Added $ShowTOC to determine if TOC is shown. Replaced Title with header in  Get-PluginHTML.

Fix #298. Fix #297.
Revert change to support $EmailReportEvenIfEmpty 

Report of email not sending since adding this - needs further testing.
Merge pull request #300 from othercwood/master

Fixed Get-vCheckPluginXML.
Merge pull request #1 from alanrenouf/master

Updating to latest