[actions] Deal with whether actions are allowed at compliation time, not evaluation time

[LeaVerou]

Currently we check if we're in an Actions context every single time an identifier is resolved: https://github.com/mavoweb/mavo/blob/main/src/mavoscript.js#L9

And use this awkward hack for that:

mavo/src/mavoscript.js

Line 890 in 7143d5f

Mavo.Actions._running = Mavo.Actions.running;

But why? All we need to do is pass to the compiler that we're in an actions context and compile the function differently in that case.