Import glob2regex

It's still missing ast optimization and some code cleanup is also
needed, but it should be working in the general case.
Also write a small unit test for it.

lib/glob2regex/CMakeLists.txt

@@ -0,0 +1,30 @@
+cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
+project(glob2regex VERSION 0.1.0 LANGUAGES CXX)
+
+find_package(Boost 1.53.0 REQUIRED)
+
+add_library(${PROJECT_NAME}
+	src/glob2regex.cpp
+	src/glob_ast.cpp
+	src/render_ast.cpp
+)
+
+target_include_directories(${PROJECT_NAME} SYSTEM
+	PRIVATE ${Boost_INCLUDE_DIRS}
+)
+target_include_directories(${PROJECT_NAME}
+	PRIVATE src
+	PUBLIC include
+)
+
+target_compile_features(${PROJECT_NAME}
+	PUBLIC cxx_range_for
+	PUBLIC cxx_defaulted_functions
+	PUBLIC cxx_auto_type
+	PUBLIC cxx_noexcept
+	PUBLIC cxx_rvalue_references
+)
+
+target_compile_definitions(${PROJECT_NAME}
+	PRIVATE BOOST_SPIRIT_USE_PHOENIX_V3=1
+)