* Make the Fork Awesome image provider URL a property and change its value
if the Plasmoid's theme changes to cause Qt Quick to redraw images
* Turn caching of Image objects off so Qt Quick actually fetches the images
again from the image provider
* Change the URL only back after returning to the event loop; otherwise Qt
Quick apparently does not react to the property change
* See https://github.com/Martchus/syncthingtray/issues/126
This should avoid:
```
file:///usr/share/plasma/plasmoids/martchus.syncthingplasmoid-git/contents/ui/main.qml:13:34: QML FullRepresentation: Binding loop detected for property "implicitWidth"
…
qml: PlasmaExtras.ScrollArea is deprecated. Use PlasmaComponents3.ScrollView instead.
…
file:///usr/share/plasma/plasmoids/martchus.syncthingplasmoid-git/contents/ui/TabButton.qml:27:13: Unable to assign [undefined] to QFont
…
file:///usr/share/plasma/plasmoids/martchus.syncthingplasmoid-git/contents/ui/ToolButton.qml:23:13: Unable to assign [undefined] to QFont
```
This should prevent the following warnings:
```
file:///usr/share/plasma/plasmoids/martchus.syncthingplasmoid/contents/ui/FullRepresentation.qml:284:17: QML DevicesPage: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
file:///usr/share/plasma/plasmoids/martchus.syncthingplasmoid/contents/ui/FullRepresentation.qml:287:17: QML DownloadsPage: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
file:///usr/share/plasma/plasmoids/martchus.syncthingplasmoid/contents/ui/FullRepresentation.qml:290:17: QML RecentChangesPage: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
file:///usr/share/plasma/plasmoids/martchus.syncthingplasmoid/contents/ui/FullRepresentation.qml:281:17: QML DirectoriesPage: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
file:///usr/share/plasma/plasmoids/martchus.syncthingplasmoid/contents/ui/FullRepresentation.qml:284:17: QML DevicesPage: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
file:///usr/share/plasma/plasmoids/martchus.syncthingplasmoid/contents/ui/FullRepresentation.qml:287:17: QML DownloadsPage: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
file:///usr/share/plasma/plasmoids/martchus.syncthingplasmoid/contents/ui/FullRepresentation.qml:290:17: QML RecentChangesPage: Detected anchors on an item that is managed by a layout. This is undefined behavior; use Layout.alignment instead.
```
See https://github.com/Martchus/syncthingtray/issues/133
The following uses of QCC1/PlasmaComponents2 remain:
```
…/DetailView.qml:import org.kde.plasma.components 2.0 as PlasmaComponents // for Menu and MenuItem
…/DevicesPage.qml:import org.kde.plasma.components 2.0 as PlasmaComponents // for Menu and MenuItem
…/DirectoriesPage.qml:import org.kde.plasma.components 2.0 as PlasmaComponents // for Menu and MenuItem
…/DownloadsPage.qml:import org.kde.plasma.components 2.0 as PlasmaComponents // for Menu and MenuItem
…/FullRepresentation.qml:import org.kde.plasma.components 2.0 as PlasmaComponents // for vertical TabBar
…/RecentChangesPage.qml:import org.kde.plasma.components 2.0 as PlasmaComponents // for Menu and MenuItem
…/TopLevelView.qml:import org.kde.plasma.components 2.0 as PlasmaComponents // for Highlight and DialogStatus.Closed (used with Menu and MenuItem)
```
Specifying the with explicitely on every level seems to fix this. Not sure
whether it is the best solution but Qt 6 will likely mess up everything
anyways so let's not put further effort into the QML stuff at this point.
