Crash in dirbrowse demo app

[Maxim Zaks]

I am running Lobster (master branch) on macOS (10.13.6)
When clicking on a folder in the dirbrowse app I get:

Assertion failed: (i < len && width == 1), function At, file ../../src/lobster/vmdata.h, line 623

[Wouter van Oortmerssen]

Thanks for reporting! That seems a regression in some of the lifetime stuff, I know how to fix it.. will get to that later.

[Wouter van Oortmerssen]

Fixed: 2e75f10
See commit description :)