Make callfuncs safer

Callfuncs with mismatched arguments will silently fail (not even a console warning!).

To mitigate this, we should automatically append _p = invalid parameters to all callfunc-exposed functions for all components. That way, the functions will be much more likely to execute and cause a runtime error instead (so you can actually see what went wrong).

Key points:

• pad all interface functions with up to 10 parameters that all default to invalid
• do not change existing parameters
• reuse the same name for all these padded parameters so that we don't blow out the crashlogs with many local vars

For example,

<component name="TestComponent">
    <interface>
        <function name="doSomething" />
    </interface>
</component>

function doSomething()
end function

would transpile to

function doSomething(__unused = invalid, __unused = invalid, __unused = invalid, __unused = invalid, __unused = invalid, __unused = invalid, __unused = invalid, __unused = invalid, __unused = invalid, __unused = invalid)
end function

BrightScript doesn't care if you use the same parameter name multiple times, so we can reduce the list of unused variables by naming it __unused over and over again.

This implementation will cause the code to fail INSIDE the function if you try to use any of the parameters.