Allow selection and copy of any disassembler widget column(s) to be pasted elsewhere (text editor)

[shazz]

Currently there is no way to export or copy the disassembly output.

Would be great to be able to:

• select lines and columns of the disassembly
• right click "copy"

[WerWolv]

Already requested in #1781. Will be added eventually. (PRs welcome!)