Selectable text in mvLogger

**Is your feature request related to a problem? Please describe.**
I use mvLogger a lot to print out interesting things about my application as I'm designing, debugging, etc. However, the text is not selectable nor copyable. It would be much more beneficial if it was.

**Describe the solution you'd like**
Make the text in the mvLogger not just a rasterized font display, but an actual text control that supports range selections, select all, copy, etc., via standard keyboard shortcuts and a context menu.

**Describe alternatives you've considered**
If I need the text output currently, I dump the text I want to a log file and then keep a text editor open to that secondary log stream. Not quite as convenient, but it works.

**Additional context**
n/a