#313 Support few more keys on OSX

[neoascetic]

Just like issue #210 (https://sourceforge.net/p/irrlicht/patches/210/).
Could we, please, have a support for few more symbols on OSX?

Someone in #211 (https://sourceforge.net/p/irrlicht/bugs/211/) tell that it seems to be fixed... but, for me, I am able to input almost all of those characters, except "{}|". That's why there is this ticket.

Thank you!

KeyCodes[kVK_ANSI_LeftBracket] = irr::KEY_OEM_4;
KeyCodes[kVK_ANSI_Backslash] = irr::KEY_OEM_5;
KeyCodes[kVK_ANSI_RightBracket] = irr::KEY_OEM_6;

[Michael Zeilfelder]

Thanks. Applied in svn trunk r5275. Sorry for not applying those 3 lines earlier, but I have no test-system for OSX. But I guess not much can go wrong in this case... (and using those OEM keys seems to make sense according to KEY_OEM documentation in Irrlicht header).