Added Free() function to XResource class, used automatically for all allocated objects when they are destructed.

Rev: lib/modules/Protocols.pmod/X.pmod/Extensions.pmod:1.4
Rev: lib/modules/Protocols.pmod/X.pmod/Requests.pmod:1.22
Rev: lib/modules/Protocols.pmod/X.pmod/Types.pmod:1.24
Rev: lib/modules/Protocols.pmod/X.pmod/XImage.pmod:1.6
Rev: lib/modules/Protocols.pmod/X.pmod/Xlib.pmod:1.25