PDFBOX-2262: Renamed confusingly named CMAP classes

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/branches/no-awt@1620713 13f79535-47bb-0310-9956-ffa450edef68
PDFBOX-2262: Remove unused and broken RAFDataStream

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/branches/no-awt@1620714 13f79535-47bb-0310-9956-ffa450edef68
PDFBOX-2262: Use MissingWidth only when widths are present

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/branches/no-awt@1620719 13f79535-47bb-0310-9956-ffa450edef68