Preliminary svelTest lexer and more PLY examples

Preliminary svelLex recognizes only reserved words and IDs/numbers
Can tokenize one line at at time with ```python svelLex.py``` or "test" sample program with ```python testSvelLex.py``` (both in the lib folder)

Also added more PLY examples (in lib/ply-examples) and moved old C-based lex/yacc work into old-C-lib