Should be able to copy-paste from GPUVis Console

[subdiff]

It would be nice to copy-paste from GPUVis console directly. On error as in #50 a window appears called "Gpuvis(sic!) Console" with the error log but selecting the text or copy-pasting everything via right click menu is not possible what makes reporting critical bugs like above cumbersome (in #50 I typed the log down manually).