* generic Device:info() function which returns the model
* add Device:canSuspend() and make it true in all devices that have suspend routines and the emulator
* also enable fake poweroff/reboot on the emulator
* add Device.home_dir
* add Device:hasExitOptions() and update menus & comments
This commit standardizes the various todos around the code a bit in a manner recognized by LDoc.
Besides drawing more attention by being displayed in the developer docs, they're also extractable with LDoc on the command line:
```sh
ldoc --tags todo,fixme *.lua
```
However, whether that particular usage offers any advantage over other search tools is questionable at best.
* and some random beautification
Either at all, or because it would impose reduced functionality.
Meaning:
* On 4bpp fb, because those are completely unsupported by the C BB
* On 24bpp fb, because it has limited support for that target format (no alpha blending).
* On 8bpp Linux eInk fb with an inverted palette (that's basically only the K4 ;)).
* On Linux eInk devices w/ no HW inversion support, as that would render NightMode inoperable.
That last point means that it's currently *always* blacklisted on PocketBook, because I don't have a PB device, so I don't know how safe HW inversion would be, meaning none of them are marked as being HW invert capable.
(I was a tiny bit hasty with https://github.com/koreader/koreader-base/pull/912 ;).)
Partially resolves#4747. Will enable switching Wi-Fi on/off in the menu and getting the network status. However, a new Wi-Fi session lasts ~100 seconds and then terminates automatically, apparently, to save the energy. I believe it can be prolonged by some networking activity. Also it is not shut down if the auto suspension is disabled.
* Pocketbook Color Lux detection
* fix rotation for Pocketbook Color Lux
* deal with 24bit RGB framebuffer that are reported as 8bit
* use default DPI for Pocketbook Color Lux
* bump base
Partial, as it will safe the state when suspending the reader by pressing the power-button.
However, it will still not safe the state when Pocketbooks autoPowerOff-Feature kicks in, as this does not create an event (e.g. no EVT_BACKGROUND) of any kind.
* Clean up device.lua
* Save state on suspend
