Use impl Into<Stroke>
as argument in a few more places
#3420
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Functions that take Stroke were updated to take Into to make them consistent with other Into parameters.
Vec2 implements DivAssign, to make it consistent with already implementing MulAssign and Div.
Vec2::angled() uses sin_cos() rather than an individual sin() and cos() call for an immeasurable but hypothetical performance improvement.
Disable the lock_reentry_single_thread() mutex test. Lock()ing twice on the same thread is not guaranteed to panic.
Closes Some minor rough edges around Painter and Vec2 API #3419.