Fix generic object spread (#30)

* Add failing test for generic spread with default props

* Do not throw an error when prop types contain a generic spread

* Update generic converter to convert utility types

$Exact<T> is now converted to T directly to make object spreading
easier to work with as we do not care about exactness when spreading
from a prop documentation perspective.

* Gitignore vscode metadata

* Add tests

* Add referenceIdName to identifiers converted in type mode

This provides a name that can be used when wanting to print the name of
a generic or similar, which is what we're doing with the typeof node.

* Update typeof to use referenceIdName if name does not exist

Author: Blasz

.gitignore

@@ -1,2 +1,3 @@
 node_modules
 *.log
+.vscode