theme: Add events for cellbroadcast

We'll add a LED event once the phosh side handles ending feedback.

We likely want to add more events based on severity/cbm type later on but can always use this one as fallback.

changed the description

We likely want to add more events based on severity/cbm type later on but can always use this one as fallback.

So that would be e.g. message-new-cellbroadcast-{emergency,earthquake,test,presidential}?

(Just browsed chapter 9.4 on https://www.etsi.org/deliver/etsi_ts/123000_123099/123041/15.02.00_60/ts_123041v150200p.pdf )

added 5 commits

• 4567c013...fc7ec6e8 - 4 commits from branch Librem5:main
• dc12f301 - theme: Add events for cellbroadcast

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mentioned in commit 0646a930