[Therion] wxWidgets 3.0.0

[Olly Betts]

I've been fighting to get loch to work with wxWidgets 3.0.0.  The first
obstacle is that they now enable __WXDEBUG__ mode by default, so misuses
of the API result in warning dialogs popping up.

I've attached a patch which fixes that, and updates a couple of places
where deprecated methods are used.

This doesn't get you a fully working loch though - starting loch and
loading a file seems to work OK, *if* loch was compiled with
optimisation.  Starting loch with a file specified on the command
line segfaults in the first call to gluScaleImage() in lxData.cxx,
though it works when run under gdb or valgrind, so I guess there is
a subtle timing issue (and that this might not happen on all machines).

There are also more uses of deprecated methods, most notably using an
implicit wxGLContext is now deprecated.  I tried to update that one, but
things seemed to crash a lot - I suspect the underlying problem noted
above needs addressing first.

I've been testing on Debian unstable (which has packages of wx 3.0.0).

Cheers,
    Olly
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