wpiutil: Add C++ libuv wrappers (#1166)

- Provide an EventLoopRunner to run uv::Loop on a separate thread.

- Add raw_ostream wrapper for uv::Buffer.

wpiutil/src/main/native/cpp/uv/Timer.cpp

@@ -0,0 +1,46 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2018 FIRST. All Rights Reserved.                             */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#include "wpi/uv/Timer.h"
+
+#include "wpi/uv/Loop.h"
+
+namespace wpi {
+namespace uv {
+
+std::shared_ptr<Timer> Timer::Create(Loop& loop) {
+  auto h = std::make_shared<Timer>(private_init{});
+  int err = uv_timer_init(loop.GetRaw(), h->GetRaw());
+  if (err < 0) {
+    loop.ReportError(err);
+    return nullptr;
+  }
+  h->Keep();
+  return h;
+}
+
+void Timer::SingleShot(Loop& loop, Time timeout, std::function<void()> func) {
+  auto h = Create(loop);
+  if (!h) return;
+  h->timeout.connect([ theTimer = h.get(), func ]() {
+    func();
+    theTimer->Close();
+  });
+  h->Start(timeout);
+}
+
+void Timer::Start(Time timeout, Time repeat) {
+  Invoke(&uv_timer_start, GetRaw(),
+         [](uv_timer_t* handle) {
+           Timer& h = *static_cast<Timer*>(handle->data);
+           h.timeout();
+         },
+         timeout.count(), repeat.count());
+}
+
+}  // namespace uv
+}  // namespace wpi