This changes references to "global notification settings" to "default
settings", which should hopefully make it clearer what these actually
are.
Also, a information tip has been added to the settings page to clarify
what these settings do and imply that the per-room settings take
precedence.
The current text has invited a lot of confusion around how notifications
work in NeoChat, because it mentions "push notifications". Some users
take it to mean that somehow the notifications appear in the background,
but that's only supported if built with KUnifiedPush.
To make it super clear, let's change the description dynamically based
on whether:
1. NeoChat is built with KUnifiedPush support.
2. We were able to connect with the KUnifiedPush daemon and your server
has a push gateway.
This standardizes on the same value used for KirigamiAddons pages like AboutKDE and About, namely largeSpacing * 4.
Now, when switching between settings pages you no longer have settings inconsistently changing heights willy nilly, header notwithstanding.
The only page that's missing is the Spellchecking page, as that needs to be fixed in Kirigami Addons' private Sonnet page.
