[no squash] Touch things

[grorp]

1. Re-add "long tap to punch" as a client-side setting

   Fixes the part of The touch_interaction introduced in 404a063fdfbbddcba32d22dd1c34dd73922bc12a needs a setting to override it #14393 that I consider acceptable. The setting doesn't seem useful to me, but it will hopefully make @j-r happy ¯\(ツ)/¯

   Typical Minetest workflow:

   1. Make a behavior change requested for years by many users
   2. One user complains
   3. Add a setting

2. Make long tap delay customizable and change default to 400ms

   For comparison:

   • current Minetest: 500 ms
   • Rollertest: 400 ms
   • PojavLauncher: 300 ms & configurable
   • new Minetest: 400 ms & configurable

3. Add shorthand form for touch_interaction

   Allows replacing this

   touch_interaction = {
       pointed_nothing = "short_dig_long_place",
       pointed_node    = "short_dig_long_place",
       pointed_object  = "short_dig_long_place",
   },

   with this

   touch_interaction = "short_dig_long_place",

To do

This PR is a Ready for Review.

How to test

1. Verify that "short tap to punch" is still the default. Verify that the touch_punch_gesture setting can be used to restore the pre-5.9 behavior of "long tap to punch".

2. Try different values for the touch_long_tap_delay setting.

3. Add this code to Mineclon* and verify that it works:

   minetest.register_on_mods_loaded(function()
       for name in pairs(minetest.registered_items) do
           if name:find("grenade") or name:find("bow") or name:find("shield") then
               print("overriding " .. name)
               minetest.override_item(name, {
                   touch_interaction = "short_dig_long_place",
               })
           end
       end
   end)

[sfan5]

LGTM