Latest version of ClassicShell was 4.3.1. There is no reason to display
any warning about very old versions (< 2.0.0).
Besides, this will remove dependency on version.dll which could be misused
for DLL hijacking attack.
Fixes#72
* Fix naming inconsistencies
'Menu' vs 'StartMenu'
* Installer: Remove Facebook link
* Installer: Remove PayPal donate remnants
* OpenShellReadme: Remove info about product version