Validate macro events

[mondalaci]

And display an error in Agent when encountering invalid event names, such as $onKeyMapChange HD2 like in https://forum.uhk.io/t/gaming-config-tips-tricks/2447/48

[mhantsch]

Would this check any macro name that starts with $, or how do you envison the validation?

[mondalaci]

Yes, the firmware should check macro names that start with $, analyze per-event name semantics, and write a status buffer error when needed, including for invalid macro events.

[mhantsch]

Which makes the $-namespace a reserved namespace. I'm good with that.