Instead of having the DBus stuff in a separate class expose the plugin class itself like we do for the other plugins.
Replace the method-based API with properties.
Change the path to <device>/battery for consistency with other plugins
We don't have a custom destructor and the copy ctor/assignment operator don't do anything special, so the default one will do the right thing.
This is in accordance with the rule of zero (https://cpppatterns.com/patterns/rule-of-zero.html)
While mostly theoretical it makes for a more expressive API since it communicates that it is a list instead of a single value. It also allows to get rid of some conversion code.
This is also preparation work for potentially using the custom type capabilities that QtDBus offers.
This automatizes the generation of logging categories so a
kdeconnect-kde.categories is generated and installed to
/usr/share/qlogging-categories5/ so kdebugsettings can use it.
Also, sets the default logging level to Warning. So now the logs
of users won't be filled with debug messages but they can
modify the configuration easily with kdebugsettings.
## Summary
Upgrade the SMS App to handle multitarget addresses in the "addresses" field of a message and drop usage of the "address" field
Also note that this has all the commits from https://invent.kde.org/kde/kdeconnect-kde/merge_requests/97, but I will rebase those away once that patch is landed
Bonus: Image composition for multitarget conversations
## Test Plan
- Apply Android-side patch https://invent.kde.org/kde/kdeconnect-android/merge_requests/80
- Launch SMS App
- Notice that you can see all the recipients of multitarget messages. (Replying still not supported, but might get implemented as part of fixing replying to single-target messages)
## Summary
Desktop companion to https://invent.kde.org/kde/kdeconnect-android/merge_requests/78
Give desktop SMS app a basic understanding of the MMSes coming from Android:
- Show a fake body if we get an attachment we can't display (for now, any attachment)
- Display a fake contact header for multi-target messages since Android does not yet export multi-target address information
- Disable attempting to reply to multi-target messages
BUG: 398889
## Test Plan
### Before:
MMS messages were silently dropped, meaning:
- Group MMS conversations were not visible
- Single-target conversations with the most-recent message an MMS were not visible
### After:
- Install https://invent.kde.org/kde/kdeconnect-android/merge_requests/78
- Multi-target conversations are displayed (kind of ugly, since they have no contact information
- Single-target conversations which end with an MMS are displayed
- Plain-text MMS is displayed nicely
- MMS attachments don't show
- MMS which are only an attachment with no body are displayed with a dummy body
