Added experimental support for BlackPill F411CE #818
                
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Added a new board to dropdown menu based on existing variant.
This is no breaking change.
Bugs are probably hiding somewhere because we are referencing a slightly different variant with the same layout to support this board.
Tests need to be done to see if everything is compatible.
I own two BlackPills F401CC and F411CE, both on the same PCB.
AliExpress link: https://www.aliexpress.com/item/4000069263843.html
The only difference seems to be 256K Flash + 64K RAM versus 512K Flash + 128K RAM.
Compiles, uploads and works for me over DFU with serial out.