Add feature flag for deferred javascript

This adds a feature flag for the jQuery and main-js requests added in
#2786 and #2958. This adds only a single feature flag since deferring
jQuery without d

Add feature flag for deferred javascript

This adds a feature flag for the jQuery and main-js requests added in
#2786 and #2958. This adds only a single feature flag since deferring
jQuery without deferring the main javascript request is likely to cause
errors and confusion.

The feature flag defaults to "on" as this should be unproblematic except
for a few plugins. Also, with this flag being on by default, it should
see more usage and is more likely to uncover existing issues.

This feature flag should be removed once this feature is deemed safe.

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Fix one remaining line being too long for PSR-12

This slipped in with #2957 between the checks on #2945 being run and
that pull request being merged.

Added password change support for argon2i/argon2id, added matching config options and hash_X functions

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PHP8 fix: Array to string conversion for array_diff_key/assoc

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Update lang.php

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Final project-wide check of curly brace deprecations.

Fix PHP 7.3 deprecations in lib/ directory.

clarified trustedproxy - empty = trust no proxy

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Update de, de-informal

sort plugins in plugin_list()

Revert "eliminate access to global $plugin_controller"

This reverts commit 2b1bb8ffafe5d72c35b81659b1d96b8dc19f0de3.

Revert "sort plugins in Config Manager"

This reverts commit d2a8ea656a16abfd37fe4ffb58d1cf7e4ddf2e15.