Function updateSettings

Updates the settings table as well as $modSettings... only does one at a time if $update is true.

updates both the settings table and $modSettings array.
all of changeArray's indexes and values are assumed to have escaped apostrophes (')!
if a variable is already set to what you want to change it to, that variable will be skipped over; it would be unnecessary to reset.
When use_update is true, UPDATEs will be used instead of REPLACE.
when use_update is true, the value can be true or false to increment or decrement it, respectively.

Package: SMF
Copyright: 2020 Simple Machines and individual contributors
License: BSD
Author: Simple Machines https://www.simplemachines.org
Located at Sources/Subs.php

Parameters summary
`array`	`$changeArray`	An array of info about what we're changing in 'setting' => 'value' format
`boolean`	`$update = false`	Whether to use an UPDATE query instead of a REPLACE query

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Function updateSettings