[SourceEditor] Treat "Xml Attribute Value" as "String" so quotes in SkipChars works in Xml
[XmlEditor] Moved attribute value completion in front of attribute name completion for higher priority
[XmlEditor] Enabled force CodeCompletion on Attribute values
[XmlEditor] More agressive CodeCompletion for Xml Attribute Name
-Display if Forced
-Display if inside XmlTagState
[XmlEditor] If forced while typing element name display CodeCompletion
[XmlEditor] XmlCompletionData does not override Icon if Icon was set
[XmlEditor] Moved Element completion lower in method to give higher priorty to attribute completion
[XmlEditor] Auto-CodeCompletion for AttributeValue & SkipChar
-After inserting attribute completion automaticlly show CodeCompletion window for AttributeValue
-After inserting attribute completion set second quoute(") to SkipChar
Merge pull request #582 from DavidKarlas/xamlCodeCompletion

Xml(Xaml) code completion improvments