* Enable before_wifi_action & after_wifi_action on hasWifiToggle platforms (which is basically all of 'em except naked SDL).
* Decouple restoreWifiAsync from hasWifiManger, because we can do that on other platforms (namely, Kindle. Probably PB, too, but WiFi is already a mess there, and I can't test it).
* Implement restoreWifiAsync on Kindle.
* Properly flag rM as hasWifiManager & hasFastWifiStatusQuery, because it is actually both of those (it uses our wpa_supplicant backend).
* Update the KOSync checks to take these changes into account, to properly disable auto_sync if necessary.
* Really made the Network* event signaling consistent. For realz this time.
* In an effort to make the whole beforeWifiAction framework somewhat usable there, we now assume connectivity is always available on !hasWifiToggle platforms...
Fix: #10539, and for context #6489, #6733, #6534
Reorganize and reword most of the settings to make it clear what actually ties into auto sync, and what doesn't. (Specifically, what happens when a pull attempts to sync forward or backward has nothing to do with auto sync, it applies in all cases; while the periodic sync *does* require auto sync).
The main point of contention, though, is that auto sync will now *always* attempt to setup network connectivity (i.e., on resume/suspend/close). Periodic sync will *not* though (the intent being that, if you use periodic sync, you're relying on the activity check to actually keep wifi on at all times)).
Since this may lead to a large amount of nagging about wifi toggles on devices w/ NetworkManager support, it is now *disabled* by default on those devices. (And given that it wouldn't have worked because of the lack of connectivity, that doesn't really make any practical difference ;p).
Additionally, given the fact that there's no way to make this behavior viable if the "before wifi" action is left at its default of "prompt", this feature now *requires* that to be set to "turn_on" (on devices where it can, of course); attempting to toggle it on will warn about that if necessary.
This change is retroactive (OTM).
Includes an assortment of fixes and cleanups, including migrating to the new LuaSettings API, which is why there's no longer a smattering of superfluous flushes.
(1) New "Book cover" button in the download dialog.
(2) Detect book that can be borrowed only (Internet Archive).
There is no support for borrowing, just showing a disabled button.
(3) Fixed some libraries, all of them work except Gallica.
Export highlights for selected files.
Having a button "Select all files in folder", it is easy to export the whole folder.
So, closes#10402.
To keep even number of buttons, added a feature "Show selected files list". May be useful to check selections before an operation. Just a sorted list, no titlebar or popup menu, tapping a file jumps to its folder.
Instead of firing on(Enter|Leave)Standby Events, and having every other piece of code that might care about that handle re-scheduling their stuff themselves; simply make the standby implementation (i.e., AutoSuspend's) shift the whole task queue by the amount of time spent in standby to re-sync everything automatically.
(This is necessary in the first place because Linux, as the task queue ticks in CLOCK_MONOTONIC, which does *not* tick during suspend/standby; while we expect most of the tasks scheduled to actually reflect real world clock delays).
When using the new option "Daily timeline starts at",
make the separator line between 23:00 and 00:00 thicker.
Also tweak time picker to pick minutes by units of 10,
and remove max hour (06:00) limitation.
Can be set for example to 04:00 to see after-midnight readings
with those of the previous evening in day timeline.
Also fix possible shifts in day start when crossing DST changes
with prev/next.
Also fix sorting (by reverse reading duration) of books at top
