std: another stab at a race-free global loop implementation

seems to hold up pretty well.

uv::hl API is affected.. had to do work on tests and std::timer code that
leverages the global loop/high_level_loop API.

see test_stress_gl_uv_global_loop_high_level_global_timer for a stress
example.. it takes a while to run, but it exits cleanly (something I could
never accomplish with earlier iterations of the global loop)

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