fix issue with defined() function

php 7.4 compatibility : string offset access syntax with curly braces…

… is deprecated

php 7.4 compatibility : string offset access syntax with curly braces…

… is deprecated

fix bug with use without alias

update scrambler version

cannot detect of which type an alias is by analysing the ast...

so merged function and classes scramble names.
both or none has to be obfuscated if an alias is used.

php 7.4 compatibility : fn is now a reserved keyword

added follow_symlinks option

corrected some namespace obfuscation bugs

can now obfuscate shebang php scripts

update version number