Move GuiDispatch from Session type to FSIPad, Session doesn't need to be aware of UI context or threading
Fix for #418.

parseResults weren't being correctly passed into FSC.GetDeclarations, and
GetDeclarations was never called when an ident could not be found.

This brings back the annoying 'type-a-dot-anywhere' issue, this can be sorted later.
findLongIdentsAndResidue is no longer an option.
Avoid showing autocomplete when typing '.' on a line that only has whitespace before the dot.
Fix build for 4.2.2
Enable Ctrl-Shift-Space to bring up parameter completion, and generally improve reliability of parameter completion 
Revert "Avoid showing autocomplete when typing '.' on a line that only has whitespace before the dot."

This reverts commit 4a020fdb12b4a988772e1f87d4969e539810393a.
Fine-tune placement of parameter completion
Simple performance fix, which is noticeable when editing large files

Instead of walking over each line (which is a red-black tree internally in MD) use the faster helper method GetLineByOffset in Monodevelop (This method implements a binary search). This is called every edit, navigate or hover.