Legacy Holo project was removed
Shadow copy refactoring

These changes simplify the startup logic. Default shadow copy settings are used.
Slight namespace and assembly name correction: HoloUI -> Holo.UI

* Holo.exe is the launcher, which performs shadow copy.
* Holo.UI.exe is the main executable. It also may be started directly, so no shadow copying will be performed.

Closed #6, fixed #11