fix add file reference (com dll)

[enricosada]

lcid is an integer
fix typelib registry path, the lcid part is the hexadecimal string representation of the lcid value
added exception on failed add reference
fix nre on if registry key not found

fix #278

[latkin]

Is there an easy way to add an IDE unit test for this? If there are standard COM libs that trigger the issue it would be cool to have a test that validates "add reference" for one of those (assuming there is unit test support for the "add reference" action, maybe there isn't)

Edit: looks like some pretty good support in Tests.ProjectSystem.References.fs

[enricosada]

maybe @lasandell can help us choose a suitable com class (he wrote the COM typeprovider ) or give a feedback about com status in vs extension or tests needed.
In the test they use COM.Microsoft Shell Controls And Automation.1.0.ShellClass

Thx @latkin i'll add a test like your hint

[enricosada]

added test

[enricosada]

the build failure is not related to this pr

Build execution time has reached the maximum allowed time for your plan (40 minutes)

[latkin]

This is applied.