Enable selection widget on graph load.

Fixes #160

Bump

Deploy Qt platform plugins

Fix long-standing layering violation. Now we make average node width …

…(for drawing purposes)

an internal thing of graphics nodes. Graph nodes do not care about this (and they should not).

As a nice side effect, this reduces the size of graph node down to 96 bytes

Disable -march=native for OGDF

Build universal binary on Mac

Relax version check

Version bump

Return to 0.9.5.1 as not all cmake versions support it

Do not forget to checkout submodules