There is still a random offset between A/V which stays
constant until there's a flush but hopefully testing should
give a clue how to fix it.

Note: the symbols required are present only since 2.2

Close #7786

That causes some duplication, but that is required for clobber lists.

If foo[i] or bar[i_index] are used in TAB_REMOVE / TAB_FIND, they will
use another variable with local scope declared inside the macro.

for (int i = 0; i < 1; i++) {
    TAB_REMOVE( count, array, foo[i] );
}

will expand to:

for (int i = 0; i < 1; i++) {
    int i_index;
    .....
    for (int i = 0; i < count; i++)
        if (array[i] == foo[i])
        {
            index = i;
            break;
        }
    .....
}

And inner scope i is used to index foo, instead of the outer scope i
which we would expect without knowing the content of the macro.

link with libm, and also with libdl which is needed

This makes use of a 3rd party circular buffer licensed under MIT.

TODO: Pause, TimeGet, Flush

Take in account the time elapsed since the last callback

Needs testing on device

TimeGet is left as an exercise for tomorrow