Add a todo list.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@64 48356398-32a2-884e-a903-53898d9a118a

TODO.txt

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+TODO
+
+Primary:
+- Finish attributes fixing
+
+Secondary:
+- Rename all classes so that they're in the namespace HTMLPurifier_*
+- Factor out all classes into their own files
+- Build an automated release system that will create minimal versions too
+- Build system that will in-line includes
+- Set up the file includes
+- Migrate all unit tests to use the lexer and generator
+- Build the entity lookup table
+
+Code issues:
+- Factor PureHTMLDefinition into a set of strategies
+- Create a TokenFactory to prevent really long lines
+- Fix the encoding problems in the lexer and generator