feat: support for register lists (ARMv7)

[cfung89]

Hi, would it be possible to add support for ARMv7 lists of registers? The following provides an example of this feature.

For PUSH { V1, V2, LR }:

Before:

(program ; [0, 0] - [1, 0]
  (instruction ; [0, 0] - [0, 17]
    kind: (word) ; [0, 0] - [0, 4]
    (ERROR ; [0, 5] - [0, 6]
      (ERROR)) ; [0, 5] - [0, 6]
    (ident ; [0, 7] - [0, 9]
      (reg ; [0, 7] - [0, 9]
        (word))) ; [0, 7] - [0, 9]
    (ident ; [0, 11] - [0, 13]
      (reg ; [0, 11] - [0, 13]
        (word))) ; [0, 11] - [0, 13]
    (ident ; [0, 15] - [0, 17]
      (reg ; [0, 15] - [0, 17]
        (word)))) ; [0, 15] - [0, 17]
  (ERROR ; [0, 18] - [0, 19]
    (ERROR))) ; [0, 18] - [0, 19]

After:

(program ; [0, 0] - [1, 0]
  (instruction ; [0, 0] - [0, 19]
    kind: (word) ; [0, 0] - [0, 4]
    (list ; [0, 5] - [0, 19]
      (reg ; [0, 7] - [0, 9]
        (word)) ; [0, 7] - [0, 9]
      (reg ; [0, 11] - [0, 13]
        (word)) ; [0, 11] - [0, 13]
      (reg ; [0, 15] - [0, 17]
        (word))))) ; [0, 15] - [0, 17]

Thank you very much!

[RubixDev]

also looks awesome! thanks again :)