Fix event progress bar in rounded corners
Fix star button size in `EventDetailPage`
Use app icon in Starred page placeholder widget
Reorganize icons, add app icons to resource, add resource path to icon theme

And remove "devel" meson option
Round list corners, fix paddings
Square EventActionRow's star button
Use icons at size "BUTTON" in main menu
Declare app's Mobile form factor in .desktop and metainfo

Support adaptive filter in Phosh>=0.12 app drawer
[WIP] Timezone support

- store datetime as UTC in db
- handle all datetime in UTC tz
- add a "timezone" setting (always `tzlocal()` at this point, without UI
  to change it)
- show datetimes in setting timezone
Move `DownloadCancelled` class into `fetcher.py`

where is needed.
Fix possible exception handling exception in Fetcher
Fix division by zero for events with zero duration

When a event has duration zero because the start and end times are identical,
ZeroDivisionError's are raised:

Traceback (most recent call last):
  File "/home/fortysixandtwo/install/lib/python3.9/site-packages/confy/widgets.py", line 130, in _on_draw
    prc = min(max(pos/dur, 0.0), 1.0)
ZeroDivisionError: float division by zero

This patch ensures that prc is either 0 if the event is in the future
or 1, if it's in the past.

Closes #18
Update IT translation
Add 'no match' placeholder for search in `StartView`
Search all talks

fix ~fabrixxm/confy#11