Allow symbols in the Disassembly Debug view

[TobyLobster]

Give the option to load a symbols file (in a vaguely standard format), and use the symbols in the Disassembly Debug view

[tom-seddon]

This has been on my to do list for ages! Would be nice if you could just give it a listing file from BeebAsm/64tass/<>/etc., and have it do its thing.

Some kind of simple regexp-based extensibility mechanism would probably let you interpret many types of listing file output from other assemblers or tools too.

[TobyLobster]

That sounds right. I vote for supporting BeebAsm because it's popular and acme (https://github.com/meonwax/acme) because I use it :-)