PDFBOX-2362: Remove .properties file usage in PDFStreamEngine

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1626070 13f79535-47bb-0310-9956-ffa450edef68
PDFBOX-2362: Allow unsupportedOperator to throw IOException

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1626074 13f79535-47bb-0310-9956-ffa450edef68