Snowberry: Dropped starting of a server

Servers are now started using the Shell, not through Snowberry. Removed
the options and code for launching a dedicated server in a terminal.
Updater: Cleanup
Shell|GUI|Unix: .desktop shortcut file for the Shell

Added the .desktop file and an application icon for the Shell.
Shell|GUI|Unix: Added .desktop file for the Shell
Windows|Installer: Added shortcut icons for the Shell

Both in the program group and on the desktop.
Builder|Windows: Check the x86 Program Files folder in dorel.bat

Inno Setup may reside in "Program Files (x86)".
Mac OS X: Removed obsolete Info.plist files for plugins
Merge branch 'drop-snowberry'
Merge branch 'drop-snowberry'
Updater|Mac OS X: Open the .mpkg after downloading an update