Blender Git Loki

Win: Add launcher to hide the console window flash

This patch fixes a long-standing complaint from users:
the console window shortly flashing when they start
blender.

This is done by adding a new executable called
blender-launcher.exe which starts blender.exe while
hiding the console.

Any command line parameters given to blender-launcher
will be passed on to blender.exe so it'll be a drop
in replacement.

Starting blender.exe on its own will still function as
a proper console app so no changes required here for
users that use blender for batch processing.

Notable changes:

Registering blender (-R switch) will now register
blender-launcher as the preferred executable.

This patch updates the installer and updates the
shortcuts to start blender-launcher.exe rather
than blender.exe

Differential Revision: https://developer.blender.org/D11094

Reviewed by: brecht, harley