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

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

Fix violations for Squiz.Commenting.DocCommentAlignment.SpaceBeforeTag

Conflicts:
	inc/parser/xhtml.php

Remove trailing preposition.

Add a full stop between sentences for the allowdebug description.

Fix violations for Generic.PHP.LowerCaseConstant.Found

Change indentation to ensure code confirms to CodeSniffer rules.

Remove whitespace from end of lines to reduce the number of CodeSniffer
violations.