PS2: Pull request to branch 1.6.0 for latest PS2 code

Hi there Team,

here comes the latest & greatest PS2 ScummVM ;-)

Changelog:

- fixed all stack issues (now PS2 build is cleanly gdb- & gprof-friendly)

- added [PlayStation2] section to scummvm.ini

- configurable: TV standard, gfx resolution, hdd partition

- modular driver loading (you can disable unused ones in [PlayStation2]

- support for latest PS2 SDK on github

- dynamic plugins enabled by default

- improved "configure" support

- code cleanup and sane casting

- see log for all changes ;-)

Please note, that we now default to latest SDK, so we'll need that for Buildbot too or daily build will fail.

You can select old SDK by undef __NEW_PS2SDK__

Let me know if you have any questions or suggestions.

Thanks,
-max