* FuriTimer: Use a local variable to wait for deletion
This combines the current synchronous behaviour
(as we could have deferred the free call too) with
a smaller FuriTimer - it's safe to pass a pointer to
a local variable to this pending timer call, because we
know it'll be finished before the caller returns
* Tighten the use of FuriThread* vs FuriThreadId
Event loop and Loader mixed those two,
but the fact those are aliases should be an implementation detail.
For this reason, thread.c is still allowed to mix them freely.
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