Fix plugin location in package

Plugins need to be in a version specific folder, rather than using "vAny", since plugins are specific to a particular major/minor release of ReSharper. Since extensions are shared across versions of Reharper, using the "vAny" folder causes ReSharper 8.1 to complain, because it's trying to load the 8.0 plugin.

The plugin files should live in v8.0. When 8.1 support is added, the new binaries should live in v8.1, and the current binaries should also be included in v8.0, to allow supporting both 8.0 and 8.1 with the same package.