[Fluxus] couple of editor fixes

[Kassen]

There seems to be a problem related to this stuff.

I was just playing some more with that "editor". Calling "(clear)" from
there predictably leads to a error;

Renderer::PopState : only one state left, not popping

I'm not sure that's the expected error but that's what I get. Then
restarting the editor script leads to a Fluxus crash soon after. I was able
to repeat this three times and wasn't able to get a crash just based on
playing with text in the "editor". Of course that's only a very coarse
analysis. The crash will give either this;

TypePrimitive::TypePrimitive: could not load font:
/usr/local/share/fluxus-017/
material/fonts/DejaVuSansMono.ttf
Aborted

or this;

terminate called after throwing an instance of 'std::bad_alloc'
  what():  std::bad_alloc

or some combination. Might be related to the issues with memory usage of
strings and operations on them that we saw a while back?

Yours,
Kas.
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