Adds ability to use right single quotes for typographic reasons

README.md

		See the source code for details.

		+# Apostrophes
		+
		+In UNICODE, apostrophes have no semantic meaning. This unfortunate decision
		+means that you have a choice in how straight apostrophes are converted to
		+your typographic requirements. Using the `-a` option, you may provide one
		+of the following values:
		+
		+* `regular` -- Keep the straight apostrophe (and curl using the font).
		+* `modifier` -- Use UNICODE character 0x02BC.
		+* `apos` -- Use `'`, which is not HTML4-compliant.
		+* `aposhex` -- Use `'`, which works with HTML4.
		+* `quote` -- Use `’`, which is semantically incorrect and will likely produce the desired typography.
		+* `quotehex` -- Use `’`, which will likely produce the desired typography without embedding the semantically misleading "name" of "right single quote".
		+
		# Build

src/main/java/com/whitemagicsoftware/keenquotes/app/Settings.java

		@CommandLine.Option(
		names = {"-a", "--apostrophe"},
		- description = "Converted apostrophe entity (regular, modifier, hex, entity)"
		+ description = "Converted apostrophe entity (see docs)"
		)
		private String mApostrophe;

src/main/java/com/whitemagicsoftware/keenquotes/parser/Apostrophe.java

		CONVERT_MODIFIER( "ʼ", "modifier" ),
		/**
		+ * Apostrophes become XML APOSTROPHE ({@code '}).
		+ */
		+ CONVERT_APOS( "'", "apos" ),
		+ /**
		* Apostrophes become APOSTROPHE ({@code '}).
		*/
		- CONVERT_APOS_HEX( "'", "hex" ),
		+ CONVERT_APOS_HEX( "'", "aposhex" ),
		/**
		- * Apostrophes become XML APOSTROPHE ({@code '}).
		+ * Apostrophes become RIGHT SINGLE QUOTATION MARK ({@code ’}).
		*/
		- CONVERT_APOS_ENTITY( "'", "entity" );
		+ CONVERT_RSQUOTE( "’", "quote" ),
		+ /**
		+ * Apostrophes become RIGHT SINGLE QUOTATION MARK in hex ({@code ’}).
		+ */
		+ CONVERT_RSQUOTE_HEX( "’", "quotehex" );

		private final String mCode;

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