Use : instead of . as the entity:component separator in paths

[emilk]

What

• Part of Standardize how we show entity paths to the user #4338

This is a very minor breaking change, where existing links in markdown to specific components of an entity will break.

Before: recording://helix/structure.Transform3D
After: recording://helix/structure:Transform3D

The purpose is to allow . as a valid character in a path part, e.g. as images/foo.jpg

Checklist

• I have read and agree to Contributor Guide and the Code of Conduct
• I've included a screenshot or gif (if applicable)
• I have tested the web demo (if applicable):
  • Full build: app.rerun.io
  • Partial build: app.rerun.io - Useful for quick testing when changes do not affect examples in any way
• The PR title and labels are set such as to maximize their usefulness for the next release's CHANGELOG

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[nikolausWest]

Are there any "custom data" examples that should be updated?

[abey79]

👍🏻

[emilk]

Are there any "custom data" examples that should be updated?

I don't know if any of them use direct links to components.
I suggest we take a pass on updating them all once #4464 is completed and published in 0.13.

Let's wait with merging this until after the coming 0.12 release, to gather all entity-path related changes up in one PR.

[teh-cmc]

I ended up implementing a very hackish version of this on my file-loading branch, because otherwise rerun my_folder_full_of_images would result in a wall of warnings.

I think we should merge this ASAP if we're going to ship the file-loading branch with 0.12.

[teh-cmc]

We decided to go through with this