Add Intellisense to SWIS

[nothrow]

Added intellisense.

Now supports

• Completion of entities and their properties
• Aliases. SELECT n.Id FROM Orion.Nodes n WHERE n. offers all columns of Orion.Nodes, both in WHERE and SELECT clause
• Very forgiving parser. It does just rough analysis of the query (does not build AST) and is able to work on query with large amount of errors and typos
• Disabling. I was not able to see any performace problem even on larger queries, but it may come handy.

Does not support

• Context sensitive intellisense for keywords. If it detects keyword may come there, it offers all of them
• Verbs, functions, navigation properties