Expose a way to create a `Loop` from a `uv_loop_t`

[noib3]

Hi, is it possible to add a method on Loop that does the equivalent of the private FromInner trait? I need to create a Loop from a uv_loop_t. Would it be possible to also make that function const?

[bmatcuk]

Hmm, seems possible, but I'd caution against it. libuv-rs uses the loop's data to track some stuff - using a uv_loop that was created outside of libuv-rs could cause a segfault if used incorrectly. If I added this feature, I'd probably mark it unsafe. Is that acceptable?

Where is this uv_loop handle coming from?