windows: improve timer precision

Improve timing precision by using QueryPerformanceCounter.

This is part of the fix for Node.js' test-timers-first-fire.js.

build, gyp: set xcode flags

ignore: include m4 files which are created manually

build: add m4 for feature/flag-testing

ignore: ignore Xcode project and workspace files

unix: fix warnings about dollar symbol usage in identifiers

unix: fix warnings when loading functions with dlsym

linux: try epoll_pwait if epoll_wait is missing

It seems that epoll_wait is implemented in glibc in terms of epoll_pwait and
new architectures (like arm64) do not implement the epoll_wai

linux: try epoll_pwait if epoll_wait is missing

It seems that epoll_wait is implemented in glibc in terms of epoll_pwait and
new architectures (like arm64) do not implement the epoll_wait syscall at all.
So if epoll_wait errors with ENOSYS, just call epoll_pwait.

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test: add test for closing and recreating default loop

windows: properly close the default loop

Also close the IOCP handle for any loop.

Closes #393

version: add ability to specify a version suffix

include: cleanup uv.h

Remove comments describing the API which are now part of the
documentation, thus avoiding future comment rot (and removing the
existing part).

doc: mention API documentation in README

doc: add API documentation

test: don't close connection on write error

The echo server shouldn't close the connection when there's an error on
write. Instead simply echo the error message and allow the other side

test: don't close connection on write error

The echo server shouldn't close the connection when there's an error on
write. Instead simply echo the error message and allow the other side to
close the connection.

Also do a partial revert of 4d905fb where after_shutdown was removed.

Fixes: 4d905fb "test: close stream immediately on error"
Signed-off-by: Trevor Norris <trev.norris@gmail.com>
Signed-off-by: Saúl Ibarra Corretgé <saghul@gmail.com>

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windows: further simplify the code for timers

- Remove the UV_HANDLE_ACTIVE flag. It's a duplicate from
UV__HANDLE_ACTIVE, which was used solely on timers and loop watchers.

-

windows: further simplify the code for timers

- Remove the UV_HANDLE_ACTIVE flag. It's a duplicate from
UV__HANDLE_ACTIVE, which was used solely on timers and loop watchers.

- Avoid duplicated code when running timers by stopping the handle and
rearming it with the repeat time, thus having a single place where the
timers are added and removed to and from the RB tree, respectively.

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gyp: remove UNLIMITED_SELECT from dependent define

It isn't really needed here.

darwin: allocate enough space for select() hack

`fd_set`s are way too small for `select()` hack when stream's fd is
bigger than 1023. Make `fd_set`s a part of `uv__stream_select_t`
s

darwin: allocate enough space for select() hack

`fd_set`s are way too small for `select()` hack when stream's fd is
bigger than 1023. Make `fd_set`s a part of `uv__stream_select_t`
structure.

fix #1461

Conflicts:
src/unix/stream.c

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darwin: allocate enough space for select() hack

`fd_set`s are way too small for `select()` hack when stream's fd is
bigger than 1023. Make `fd_set`s a part of `uv__stream_select_t`
s

darwin: allocate enough space for select() hack

`fd_set`s are way too small for `select()` hack when stream's fd is
bigger than 1023. Make `fd_set`s a part of `uv__stream_select_t`
structure.

fix #1461

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unix, windows: don't allow a NULL callback on timers

windows: simplify code in uv_timer_again

Remove duplicated code by directly calling uv_timer_stop

test: use less requests on tcp-write-queue-order

Makes the test reliably pass on Windows, otherwise the runtime aborts.

unix: stop child process watcher after last one exits

unix: simplify how process handle queue is managed

windows: remove duplicated field

Fixes build