Timeout issues/improvements

[vertigo220]

Is your feature request related to a problem? Please describe.

I was just manually typing a password from KeePassDX onto a computer and it was taking a while as the site kept saying it was wrong (first due to me typing an O as a 0, but then because the site is clearly screwy) and because it's a long password. As I was doing this, it timed out on me multiple times, locking the database. It did this despite my periodically scrolling a bit and even after I increased the timeout (which was clearly not long enough, and also has security concerns associated with doing so. And then, when it would do this, every time I had to manually reselect the key file, sign back in, and search for and open the entry.

Describe the solution you'd like

There are multiple things that can be done to improve this:

1. Allow tapping and/or scrolling to reset the timeout (it looks like this was brought up as a possible problem is #562)
2. Add a warning that it's about to timeout, allowing the user to tap to keep it open (ideally with customizable warning time and vibration and sound).
3. Add a button to keep it unlocked until manually locked or the screen is turned off.
4. Add an option to remember the keyfile if locked due to timeout and/or if it's been under a user-defined amount if time since it last locked.
5. Have it (optionally?) remember the last open entry and automatically go back to it (this was also mentioned in #1185).

I'd ideally like all of these together, though I'd say 2, 4, and 5 are the ones I'd like the most and, if they're done, 1 and 3 aren't really necessary, and since 1 seems to have potential downsides noted in the other issue and 3 could be a security concern, with the others these two are not only not necessary but perhaps not a good idea.

Describe alternatives you've considered

Covered above.

*Additional context Add any other context or screenshots about the feature request here.