* Do not ask for WRITE_EXTERNAL_STORAGE in Android 11+ (writing to "Downloads" is [allowed by default since 11](https://stackoverflow.com/questions/70248631/starting-from-android11-do-i-need-to-comply-to-androids-saf-just-to-even-creat)).
* Do not check for permissions before receiving a file. Try and let it error out, instead of silently doing nothing.
* Fix not offering to open content:// urls (we checked the URLs to be file:// urls to then convert them to content://).
* Better permission explanation text.
Removes conditional code for older Android versions (IceCreamSandwitch, JellyBean, KitKat, Lollipop) since we no longer support Android older than Lollipop (5.0).
This doesn't remove KitKat support in the SFTP plugin since it's a bit more convoluted. It will be done in a separate MR.
On Android 10 and above, Clipboard needs to be manually sent. Recently the app was shipped with the patches so that users can use adb to grant the required permissions for automatic clipboard propagation.
In case the permissions were granted for automatic clipboard propagation, 'Send Clipboard' option was hidden from persistent notification but was not removed from the DeviceFragment. This MR addresses this.
Certain implementations of the protocol (namely GSConnect) use UUIDS
for the device IDS/command keys, which contain hyphens in them. The
current implementation of RunCommandControlsProviderService (used for
the android 11 power menu command control things) gives the controls
unique IDS with "{deviceid}-{commandkey}" and then tries to split on the
hyphen, which obviously breaks if the device id or command key contain
hyphens. This patch changes it to uses colons to separate them instead.
Note that I've only tested this with GSconnect, but I see no reason why
it wouldn't work with the normal KDE connect implementation too, unless
it uses colons in IDs.
