Flatpak now allows dashes in the app id

[Alexander Larsson]

Flatpak has long disagreed with dbus on whether dashes are allowed in
names (bus name vs flatpak app ids). DBus allows them (but not in
object paths) and flatpak doesn't.

However, a lot of pre-existing apps *do* use dashes, and recently
GApplication was changed to allowed this (and the details were made
more clear in the dbus spec), so today I landed a change in flatpak
that allows this.

However, for "special" reasons, we additionally disallow application
ids to end with "-symbolic", in order to be able to handle exporting
symbolic application icons.

For details, see: 

 https://github.com/flatpak/flatpak/commit/5c075525a8b14aefbaf7f3d45920bd1d8f7e110c

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 Alexander Larsson                                            Red Hat, Inc 
       alexl at redhat.com            alexander.larsson at gmail.com 
He's a maverick hunchbacked paranormal investigator who dotes on his 
loving old ma. She's a brilliant hip-hop stripper in the wrong place at 
the wrong time. They fight crime!