Add reset button (Incomplete, work needed)

[An0n3m0us]

Ref: #8064
Adds a reset button for the keys.

Here's the process:

1. Mess up the keys.
2. Press the reset button (menu quits)
3. Open "Change Keys" and they are all already reset.

There are a few problems. It's my first time programming in C++ so some parts of the code are incorrect.

1. The keys text needs to update when the reset button is pressed instead of having to quitMenu();
2. Currently, the keys are reset to an array that I created in the loop (see line 290), instead of getting the list of keys from the settings script or elsewhere. The array isn't initialized properly either.
3. I copied acceptInput() and used it as a template, but some of the code might not be needed.

Tasks:

• Make buttons reset correctly.
• Make GUI automatically update when reset button is pressed
• Create an "Are you sure?" popup or double click to make sure.
• Fix Segmentation fault (core dumped) error.

[An0n3m0us]

Instead of quitting the menu, it needs to be updated somehow.

[paramat]

Why is this needed? Keybindings are changed occasionally one by one as required.

[An0n3m0us]

In the case of someone wanting to reset them all, they don't have to delete minetest.conf.

[paramat]

Ok, but why would they want to reset them all? This would be very rarely needed as players do not suddenly revert their controls to default one day. Changing controls is done one by one gradually.

[An0n3m0us]

True.
What about instead having a reset key for each key (or a button to reset each key)? Like escape or backspace?

Something or some way is needed to reset the keys other than deleting minetest.conf.

[SmallJoker]

What about instead having a reset key for each key

Partially related: #8282 uses the keys to clear the contents.

[An0n3m0us]

Oh, oops I didn't come across that.
Is there a need to reset all the buttons at once? Personally, I think it wouldn't do any harm to have one anyway. It might be used rarely, but I'm sure it will still be used.

[Desour]

The reset all button could be pressed on accident, which might be very annoying.

[An0n3m0us]

@DS-Minetest That's why it might need an "Are you sure" popup like I mentioned above.

[An0n3m0us]

Done! Everything seems to work fine now.
EDIT: Segmentation fault can still be triggered by pressing the button once then pressing cancel.

[paramat]

No progress for 6 months and seems mostly unnecessary.