Revert to \define colour macro for backwards compatibility

[pmario]

This PR should fix #8326

Please test.

The new functions @ericshulman suggested are implemented like this:

• core functions are prefixed tf. to allow us to use them like tf.colour<name> instead of function[tf.colour],<name>
  • Both versions should be possible
• For convenience there are 2 colou?r functions: tf.colour(name) and tf.color(name)
  • They should work with eg: <div style.background=<<tf.colour alert-background>>>
• Test: <<tf.colour sidebar-tab-border>> lets you test the recursive resolution "since sidebar-tab-border" uses <<colour tab-border>> in vanilla
• The regexp should be able to allow unicode whitespace

Sorry for the trouble :(
I'll add some tests and some docs if it gets merged.

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[Jermolene]

Hi @pmario given my comment on Talk, I would rather we just reverted the changes, and not introduce the new functions.

[pmario]

@Jermolene -- I did remove the new functionality. So it only reverts to the old colour-macros

[Jermolene]

Thanks @pmario

[Jermolene]

Hi @pmario wasn't the \whitespace trim new in v5.3.4? I think we should probably revert that too.