Remove errant BOM :bomb::bomb::bomb:

This was making the VSIX installer ignore
the registry file entirely and causing MD
files to open in the wrong native editor.
Create IVsIntellisenseProject directly

Allows multiple language services per file
Thanks to @jasonmalinowski

Doesn't actually work at all, unfortunately
Simplify & expand IVsIntellisenseProject code

IVsIntellisenseProject now creates successfully,
but still doesn't work.

VB succeeds until GetLanguage()
C# succeeds until GetContainedLanguageFactory()

Interestingly, a Watson dialog appears while
calling Init() on the C# IVsIntellisenseProject.