[g3log] Add new port (#5961)

* [g3log] Add new port (fix #5684, fix #5941)

* [g3log] Remove usage

* [g3log] Restore usage

* [g3log] Add UNIX support

* [g3log] Use vcpkg_install_cmake

* [g3log] Update to 2019-05-14

* [g3log] Update version number

ports/g3log/CONTROL

@@ -0,0 +1,3 @@
+Source: g3log
+Version: 2019-05-14-1
+Description: Asynchronous logger with Dynamic Sinks

ports/g3log/portfile.cmake

@@ -0,0 +1,41 @@
+include(vcpkg_common_functions)
+
+vcpkg_from_github(
+    OUT_SOURCE_PATH SOURCE_PATH
+    REPO KjellKod/g3log
+    REF 376c417ad170228fa6d1b9994a6e07a2ac143a51
+    SHA512 fd442b895f0be2489d2be099b1faca5c964f1a3880e3867726efb5f5a17192fbf2c2d60cf118e1b68bea73cf328f0b16c0265ec0f0c0fbbb1f62f68a994f5b86
+    HEAD_REF master
+)
+
+string(COMPARE EQUAL "${VCPKG_LIBRARY_LINKAGE}" "dynamic" G3_SHARED_LIB)
+string(COMPARE EQUAL "${VCPKG_CRT_LINKAGE}" "dynamic" G3_SHARED_RUNTIME)
+
+# https://github.com/KjellKod/g3log#prerequisites
+set(VERSION "1.3.2-95")
+
+vcpkg_configure_cmake(
+    SOURCE_PATH ${SOURCE_PATH}
+    PREFER_NINJA
+    OPTIONS
+        -DG3_SHARED_LIB=${G3_SHARED_LIB} # Options.cmake
+        -DG3_SHARED_RUNTIME=${G3_SHARED_RUNTIME} # Options.cmake
+        -DADD_FATAL_EXAMPLE=OFF
+        -DADD_G3LOG_BENCH_PERFORMANCE=OFF
+        -DADD_G3LOG_UNIT_TEST=OFF
+        -DVERSION=${VERSION}
+)
+
+vcpkg_install_cmake()
+
+vcpkg_copy_pdbs()
+
+vcpkg_fixup_cmake_targets(CONFIG_PATH lib/cmake/g3logger TARGET_PATH share/g3logger)
+
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/include)
+
+# Handle copyright
+configure_file(${SOURCE_PATH}/LICENSE ${CURRENT_PACKAGES_DIR}/share/${PORT}/copyright COPYONLY)
+
+# CMake integration test
+vcpkg_test_cmake(PACKAGE_NAME g3logger)