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Replace tabs with spaces

Replace tabs with spaces to fixed the
Generic.WhiteSpace.DisallowTabIndent.TabsUsed sniff.

Fix CodeSniffer whitespace violoations

Removed extraneous whitespace to eliminate errors reported by the
Squiz.WhiteSpace.SuperfluousWhitespace sniff.

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Fix CodeSniffer violations for PHP files

Fix violations for Squiz.Commenting.DocCommentAlignment.SpaceBeforeTag

Conflicts:
inc/parser/xhtml.php

Fix CodeSniffer violations

Change indentation to ensure code confirms to CodeSniffer rules.

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improved bundled plugin descriptions

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