Modifiers for reparenting and convert to absolute strategies

[gbalint]

Description:
To make our canvas interactions more predictable I put reparenting and conversion to absolute behind modifier keys:

• cmd is needed for reparenting
• ctrl is needed for conversion to absolute

Notes:

• Nearly 70 tests were broken (nearly all reparenting and convert-to-absolute tests). In most of the cases I just had to add the necessary modifiers to make the tests work
• Insertion relies on reparenting, I needed to modify the draw-to-insert strategy too
• cmd disables snapping, so now it is not possible to have snapping during reparenting (I needed to disable the tests for this)
• space forces convert to absolute, this is in partial conflict with ctrl, but they are not really the same: without ctrl convert-to-absolute strategies are disabled, but even with ctrl other strategies are still possible, while space really forces convert-to-absolute strategies
• when you have a selection, cmd mouse down on a descendant element will change the selection to the descendant. If you don't want that, you need to press cmd after the mouse down.
• with ctrl, you always need to press it after mouse down, otherwise the context menu will open
• earlier cmd had a special meaning in case of reparenting: it allowed the element to be reparented into a parent which is smaller than the element itself. This distinction doesn't exist anymore, because without pressing cmd there is no reparent at all

Manual Tests:
I hereby swear that:

• I opened a hydrogen project and it loaded
• I could navigate to various routes in Preview mode

Fixes #6047

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[relativeci]

#13346 Bundle Size — 62.66MiB (~+0.01%).

fd6912d(current) vs 6339ece master#13341(baseline)

Warning

Bundle contains 70 duplicate packages – View duplicate packages

Bundle metrics   2 changes 1 regression

	Current #13346	Baseline #13341
Initial JS	45.71MiB(~+0.01%)	45.71MiB
Initial CSS	0B	0B
Cache Invalidation	21.62%	22.26%
Chunks	30	30
Assets	33	33
Modules	4374	4374
Duplicate Modules	524	524
Duplicate Code	31.7%	31.7%
Packages	469	469
Duplicate Packages	70	70

Bundle size by type   2 changes 1 regression 1 improvement

	Current #13346	Baseline #13341
JS	62.65MiB (~+0.01%)	62.64MiB
HTML	11.16KiB (-0.33%)	11.2KiB

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