Add support for input.text in commands run with hotkeys

[Mm2PL]

After this PR commands executed with Split -> runCommand ("Split->Run a command") will have the input.text placeholder available.
Note that this doesn't transfer to another command being run from this special command execution.

Working hotkey:

Category: Split; Action: runCommand
Arguments:
test: {input.text}

One that doesn't work by design:

Category: Split; Action: runCommand
Arguments:
/useinputtextplaceholder