Simplified structure, added development tools

I simplified the structure of the SDK and added development tools which have proven to be very useful in my workflow. The tools include

- Unicode escape sequence converter for use in Stringtable files
- "Compile Directory" command which compiles all *.py files to *.pyc files
- "Create *.egg" command which converts a directory to a *.egg file, optionally included non-Python files and preferring *.pyc over *.py files