Add access=unknown to presets

[mkoniecz]

What steps will reproduce the problem?

1. Map parking from aerial images of unknown access status
2. Start adding access=unknown

What is the expected result?

unknown is autocompleted

What happens instead?

It is not

Please provide any additional information below. Attach a screenshot if possible.

Triggered by ​https://github.com/openstreetmap/id-tagging-schema/pull/196

access=unknown is useful to denote that access is unknown for features where users/mappers/editors assume some access state if tags is missing and mapper is unable to check accessibility but is able to map the feature

Data consumers typically assume that amenity=parking without access tags is public, and when mapping from aerial imagery some parking will be likely (but not certainly) access restricted, in such cases tagging them unknown would be a good idea.

Note: I am main author of ​https://wiki.openstreetmap.org/wiki/Tag:access%3Dunknown - please do not treat it as significant indicator of independent opinion (but it works as a weak one as noone wanted to edit it significantly so far)

This would partially revert https://josm.openstreetmap.de/ticket/11070

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2021-12-21 15:17:17 +0100 (Tue, 21 Dec 2021)
Revision:18351
Build-Date:2021-12-22 02:31:06
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (18351 en) Linux Ubuntu 20.04.3 LTS
Memory Usage: 569 MB / 3974 MB (176 MB allocated, but free)
Java version: 11.0.13+8-Ubuntu-0ubuntu1.20.04, Ubuntu, OpenJDK 64-Bit Server VM
Look and Feel: javax.swing.plaf.metal.MetalLookAndFeel
Screen: :0.0 1920×1200 (scaling 1.00×1.00) :0.1 1920×1200 (scaling 1.00×1.00)
Maximum Screen Size: 1920×1200
Best cursor sizes: 16×16→16×16, 32×32→32×32
Environment variable LANG: en_US.UTF-8
System property file.encoding: UTF-8
System property sun.jnu.encoding: UTF-8
Locale info: en_US
Numbers with default locale: 1234567890 -> 1234567890
Desktop environment: LXQt
Java package: openjdk-11-jre:amd64-11.0.13+8-0ubuntu1~20.04
Java ATK Wrapper package: libatk-wrapper-java:all-0.37.1-1
libcommons-logging-java: libcommons-logging-java:all-1.2-2
fonts-noto: fonts-noto:-
Dataset consistency test: No problems found

Plugins:
+ buildings_tools (35823)
+ measurement (35640)
+ reverter (35869)
+ todo (30306)

Validator rules:
+ https://josm.openstreetmap.de/josmfile?page=Rules/OSMLint&zip=1
+ ${HOME}/Documents/install_moje/OSM software/manual editing and discussions/josm/resources/data/validator/deprecated.mapcss

Last errors/warnings:
- 00014.495 W: Failed to add ${HOME}/Documents/install_moje/OSM software/manual editing and discussions/josm/resources/data/validator/deprecated.mapcss to tag checker
- 00014.496 W: java.nio.file.NoSuchFileException: ${HOME}/Documents/install_moje/OSM software/manual editing and discussions/josm/resources/data/validator/deprecated.mapcss