Travis CI improvements:

FIXES: #2527

* define custom docker image for travis-linux builds based on
  package build image
* add macos builds
* add windows builds (currently allowed to fail)
* improve build and shell scripts as required for the CI envs
* add asio timer latency workaround
* omit several manual tests from TravisCI which cause memory exhaustion

bin/sh/install-boost.sh

@@ -1,33 +0,0 @@
-#!/bin/sh
-# Assumptions:
-# 1) BOOST_ROOT and BOOST_URL are already defined,
-# and contain valid values.
-# 2) The last namepart of BOOST_ROOT matches the
-# folder name internal to boost's .tar.gz
-# When testing you can force a boost build by clearing travis caches:
-# https://travis-ci.org/ripple/rippled/caches
-set -e
-
-if [ -x /usr/bin/time ] ; then
-  : ${TIME:="Duration: %E"}
-  export TIME
-  time=/usr/bin/time
-else
-  time=
-fi
-
-if [ ! -d "$BOOST_ROOT/lib" ]
-then
-  wget $BOOST_URL -O /tmp/boost.tar.gz
-  cd `dirname $BOOST_ROOT`
-  rm -fr ${BOOST_ROOT}
-  tar xzf /tmp/boost.tar.gz
-  cd $BOOST_ROOT && \
-    $time ./bootstrap.sh --prefix=$BOOST_ROOT && \
-    $time ./b2 cxxflags="-std=c++14" -j$((2*${NUM_PROCESSORS:-2})) &&\
-    $time ./b2 install
-  
-else
-  echo "Using cached boost at $BOOST_ROOT"
-fi
-

bin/sh/install-vcpkg.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+set -exu
+
+if [[ -z ${COMSPEC:-} ]]; then
+    EXE="vcpkg"
+else
+    EXE="vcpkg.exe"
+fi
+
+if [[ -d "${VCPKG_DIR}" && -x "${VCPKG_DIR}/${EXE}" ]] ; then
+    echo "Using cached vcpkg at ${VCPKG_DIR}"
+    ${VCPKG_DIR}/${EXE} list
+    exit
+fi
+
+if [[ -d "${VCPKG_DIR}" ]] ; then
+    rm -rf "${VCPKG_DIR}"
+fi
+
+git clone --branch 2019.06 https://github.com/Microsoft/vcpkg.git ${VCPKG_DIR}
+pushd ${VCPKG_DIR}
+if [[ -z ${COMSPEC:-} ]]; then
+    chmod +x ./bootstrap-vcpkg.sh
+    ./bootstrap-vcpkg.sh
+else
+    ./bootstrap-vcpkg.bat
+fi
+popd
+# TODO  -- can pin specific ports to a commit/version like this:
+#git checkout <SOME COMMIT HASH> ports/boost
+
+${VCPKG_DIR}/${EXE} install openssl
+

bin/sh/setup-msvc.sh

@@ -0,0 +1,38 @@
+
+# NOTE: must be sourced from a shell so it can export vars
+
+cat << BATCH > ./getenv.bat
+CALL %*
+ENV
+BATCH
+
+while read line ; do
+  IFS='"' read x path arg <<<"${line}"
+  if [ -f "${path}" ] ; then
+    echo "FOUND: $path"
+    export VCINSTALLDIR=$(./getenv.bat "${path}" ${arg} | grep "^VCINSTALLDIR=" | sed -E "s/^VCINSTALLDIR=//g")
+    if [ "${VCINSTALLDIR}" != "" ] ; then
+      echo "USING ${VCINSTALLDIR}"
+      export LIB=$(./getenv.bat "${path}" ${arg} | grep "^LIB=" | sed -E "s/^LIB=//g")
+      export LIBPATH=$(./getenv.bat "${path}" ${arg} | grep "^LIBPATH=" | sed -E "s/^LIBPATH=//g")
+      export INCLUDE=$(./getenv.bat "${path}" ${arg} | grep "^INCLUDE=" | sed -E "s/^INCLUDE=//g")
+      ADDPATH=$(./getenv.bat "${path}" ${arg} | grep "^PATH=" | sed -E "s/^PATH=//g")
+      export PATH="${ADDPATH}:${PATH}"
+      break
+    fi
+  fi
+done <<EOL
+"C:/Program Files (x86)/Microsoft Visual Studio/2017/BuildTools/VC/Auxiliary/Build/vcvarsall.bat" x86_amd64
+"C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Auxiliary/Build/vcvarsall.bat" x86_amd64
+"C:/Program Files (x86)/Microsoft Visual Studio 15.0/VC/vcvarsall.bat" amd64
+"C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/vcvarsall.bat" amd64
+"C:/Program Files (x86)/Microsoft Visual Studio 13.0/VC/vcvarsall.bat" amd64
+"C:/Program Files (x86)/Microsoft Visual Studio 12.0/VC/vcvarsall.bat" amd64
+EOL
+# TODO: update the list above as needed to support newer versions of msvc tools
+
+rm -f getenv.bat
+
+if [ "${VCINSTALLDIR}" = "" ] ; then
+  echo "No compatible visual studio found!"
+fi