Update Python server implementation and Python sample code to support Python 3 and backwards compatibility with Python 2

[daluu]

Currently, executing the server with defaults (no parameters) results in the following error:

…\autoitdriverserver_python>python server.py

File “server.py”, line 182
print “script2exec: %s” % script
^
SyntaxError: invalid syntax

Need to find and fix all the Python 3.x incompatibilities in the current server implementation that was targeted/tested against Python 2.7.x. Should also check if the code will run with Python 2.5/2.6 as well.

[daluu]

Should be fixed with latest revision e3c9f34. Though I haven't checked all cases, but should be pretty much it.

NOTE: the update/fix targets/supports Python 3.3+ and Python 2.6+, we're not targeting support for Python 2.5, Python 3.1, 3.2. But I only tested for Python 2.7 and Python 3.4.

Reopen if there's still any compatibility issue for the server and Python sample code.