Rebuild double quoted string parser - improve code quality
Fix bag PHP parsing rules understanding: octal escape sequences were being translated as decimal ones (rebuilt double quoted string parser)
Correct bad unit test source files with decimal translation of octal escape sequences
Fix bug on converting string with decimal escape sequence in place of an octal one
Fix unnecessary backslash escaping on single quoted strings
Fix bug when taking the end of string as part of an escape sequence (rebuilt double quoted string parser)
Add test for hex and octal escape sequences length computing errors