Test: configurable font in debug console

[isidorn]

Refs: #1957

• win @stevencl
• macOS @auchenberg
• linux @aeschli

Complexity: 3

It is now possible to change the font size, font family and line height in the debug console.
To test start debugging a simple program with output (for example our smoketest express application). Have debug console open, make sure there is content and verify:

• All the sizes and fonts look as before
• You can change the following configurations and they have immediate impact debug.console.fontSize, debug.console.fontFamily, debug.console.lineHeight
• When changing the values of these configurations make sure there is no screen cheese and everything is rendered nicely
• Make sure that the default lineHeight value automatically adjusts to fontSize