Add option to `decompile-headless.sh` to list all functions in binary

[xlauko]

Tasks

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1. Add option -l,--list-functions to show all know functions in processed binary
2. This will require another ghidra script ListFunctions.java.
3. For clarity rename PatchestryScript.java to DecompileFunction.java and update docs where needed.
4. If ghidra ends with PatchestryScript.java> Function not found: let user know what are the options.
5. Add option to decompile all functions in a file.