WIP to reflect the changes from #8039 [and #10456].

Context Menu > OSM Data Layer

Data layers contain map data objects downloaded from OpenStreetMap or created and edited by users, usually meant to upload them back to OSM. Special layer states may block this.

Context menu

OSM data layers have following context menu:

	Activate	Shift+A+[0-9]
	Show/Hide	Shift+S+[0-9]
	Delete
	Merge
	Duplicate
	Save
	Save as ...
	Export to GPX ... (expert mode only)
	Convert To GPX Layer (expert mode only)
	Rename Layer
	Encourage/discourage upload (only in expert mode)
	Data consistency test
	Info

Layer States

Normally all actions are possible with the data in a layer. But three switches can change this:

Layer State		Upload	Download	Block	Behaviour
	Default	.	.	.
	Rework	false	.	.	Warn before upload
	Test/Blocked	never	.	.	Download and edit
	Private	never	never	.	Only editing
	Locked	.	.	true	No action possible

The Upload switch can be toggled to false with Upload the context menu mentioned above. For all other switches the .osm-file must be edited with a text editor:

# Default file header 
# Implying upload='true', download='never' and locked='false'
<osm version='0.6' generator='JOSM'>

# To warn before uploading. Same as Upload='checked' in 
# the Layer list context menu for the OSM data layer
<osm version='0.6' generator='JOSM' upload='false'>

# To block uploads
<osm version='0.6' generator='JOSM' upload='never'>

# To block downloads:
<osm version='0.6' generator='JOSM' download='never'>

# To lock a file. 
# This implies download='never'
<osm version='0.6' generator='JOSM' locked='true'>

Do we need separate HelpTopics like this while having no GUI? Help/Action/BlockDownload and Help/Action/LockedLayer

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