[Specification] Industry Codes table refactor

[johcarter]

## Description

• Removed spaces in scheme names in industry codes table to align with enumerated values in OtherValues tab (eg US SIC --> USSIC)
• Put all schemes in one long table rather than three separate tables

Reasons for change

Consistency of industry scheme names in specification, and consolidate code lists to make them more machine-readable ## Scope of change Specification - [ ] Location File - [ ] Accounts File - [ ] Reinsurance Scope - [ ] Reinsurance Info ## Impact of change None

[MattDonovan82]

Nothing further to add here. Moving to done.