Added an IR custom command function to IR files in the "Files" app

[PixelGames987]

Proposed Changes

This pull request adds a way to run single IR payloads from the Files app instead of going back to IR > custom IR.

Types of Changes

This is a simple, new feature.

Verification

The new single ir function works exactly the same as going into IR > custom IR > selecting a file > custom cmd.

User-Facing Change

NONE

[bmorcelli]

Why not split the function otherIRcodes() in 2, where otherIRcodes will call this second function running the file?

https://github.com/BruceDevices/firmware/blob/dev/src%2Fmodules%2Fir%2Fcustom_ir.cpp#L219

I say it because with your suggestion we have 2 functions doing practically the same thing...

Running .ir file from Files is good, but it is also good to choose between "Choose a cmd" and "Spam all cmds", because most .ir files have multiple commands.