Upgrade jQuery 3.5.0 to jQuery 3.5.1

Fixes jQuery regressions laid out here: https://blog.jquery.com/2020/05/04/jquery-3-5-1-released-fixing-a-regression/

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added tests for color handling in style manager

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style manager: use color picker based on value #3160

Instead of trying to guess if a setting is expecting a color base on the
setting's name it is now determined based on the value in it. Only hex
c

style manager: use color picker based on value #3160

Instead of trying to guess if a setting is expecting a color base on the
setting's name it is now determined based on the value in it. Only hex
colors are supported (it's the only thing the type="color" input
supports either).

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style manager: ensure all values are fresh

Always reinitialize the style replacements on loading the manager to
ensure it reflects the saved state.

style manager: adjust colors to 6 chars. fixes #3160

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use envvars in shebang

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Add flexbox to admin menu link to fix text width

The previous implementation assigns the whole width of the parent ul to the text area, which brings some text (fr) overlapping the icon in the second

Add flexbox to admin menu link to fix text width

The previous implementation assigns the whole width of the parent ul to the text area, which brings some text (fr) overlapping the icon in the second row. Adding flexbox should be most backward-compatible and ensures a proper width being set.

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add datetime option to info plugin

It simply displays the time of the last render() call. This is useful
for cache debugging

readd lib/exe/indexer.php for now. fixes #3137

This ensures backward compability (especially for testing purposes)

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