Issues

@if(!env::WIN32) for UNIX fields, which is not great. Consider adding @if(env::UNIX)
double as C3 type, not C. Needs to be checked for bugs

Todoes

Port all tests from libuv GitHub to test bindings
Check if fields order is neceserry for libuv to work properly. If not, consider simplifying dublicate fields for multiple platforms
UV_PLATFORM_SEM_t for all platforms. Currently is CLong which is not correct
Implement ipv6