Implement a way to post functions to the main loop

[igrr]

This should provide an easy way to trigger blocking code from interrupts and timers without having to pass events through flags.

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[mangelajo]

+1!

[baruch]

Why not make this a library? as it is it will be a burden to any system since it runs in the main outside of the loop. If someone wants this functionality is it so hard to add a call to a library inside the loop to run this?

[igrr]

Currently the "burden" is one extra function call and one if (ptr !=0) check, plus a few global variables. I wouldn't exactly call that a burden, compared to all other stuff which happens in main.

[baruch]

It also pulls all the code and space needed for the list of function pointers. It's not a big burden but ram is not so plentiful that it can be completely ignored. I'm not going to press this in any way, it's a design philosophy more than anything else.