Add a listing tab in the message pane

[privat]

An assembly listing contains the original assembly source annotated with the addresses and the generated binary code.
You can have it with GNU as with the option -al for instance.

$ riscv64-linux-gnu-as -al hello-riscv.s 
   1              	.text
   2              	.global _start
   3              	_start:
   4 0000 93080004 		li a7, 64
   5 0004 13051000 		li a0, 1
   6 0008 97050000 		la a1, helloStr
   6      93850500 
   7 0010 1306F000 		li a2, 15
   8 0014 73000000 		ecall
   9 0018 9308D005 		li a7, 93 # exit
  10 001c 13050000 		li a0, 0
  11 0020 73000000 		ecall
  12              	.data
  13 0000 48656C6C 	helloStr: .string "Hello, RISC-V!\n"
  13      6F2C2052 
  13      4953432D 
  13      56210A00 

Listings are a great tools for educational purpose as it shows the translation to machine code, endianness, alignment, etc.

We could add a new tab listing in the message panel that shows the listing in a read-only text-area.