Remove unclear licensed fixedsys font

[falkTX]

The "fixedsys.ttf" font file does not have a clear license, seems a very old font that got some used by microsoft at some point.
But I couldn't find details on allowed uses, redistribution, derivatives, etc.
As such, it is unsuitable for use in a GPL licensed project.
It also complicates packaging.

This font is never used in the code though, as the C++ classes that reference it are defined but never used.
So I replaced it with the monospaced font provided by VCV Rack, just so it still works in case these classes are later on used in some new modules.

[hires]

It's some old font I found somewhere and I use it in some other plugins that use the same libs. I'm pretty sure it's so generic that nobody is going to care about it, especially if it's not used in this project.

[hires]

I have found and replaced fixedsys.ttf with one that has an open license and added info about it in an accompanying file.

[dromer]

Why did you rename the new font to the old (proprietary) name? this will likely just confuse anyone using the project.

[hires]

Why did you rename the new font to the old (proprietary) name? this will likely just confuse anyone using the project.

Many of my plugins use the original file so I wanted to modify it "upstream" as it were. The accompanying text file explains the origin of the file so there shouldn't be any confusion.