Windows support contribution:

- Move CMake modules from cmake_modules/ to cmake/modules/
 - CMake now use cmake/config_windows.h.cmake to create config.h on Windows platform
 - contrib/windows.h header is automagically included by config.h
 - Put missing NFC_EXPORT macro on front of emulation API
 - nfc-mfclassic and nfc-mfcultralight examples are now compiled under Windows
Many thanks to Glenn Ergeerts which provide the initial patch.

cmake/modules/UseDoxygen.cmake

@@ -0,0 +1,100 @@
+# - Run Doxygen
+#
+# Adds a doxygen target that runs doxygen to generate the html
+# and optionally the LaTeX API documentation.
+# The doxygen target is added to the doc target as dependency.
+# i.e.: the API documentation is built with:
+#  make doc
+#
+# USAGE: GLOBAL INSTALL
+#
+# Install it with:
+#  cmake ./ && sudo make install
+# Add the following to the CMakeLists.txt of your project:
+#  include(UseDoxygen OPTIONAL)
+# Optionally copy Doxyfile.in in the directory of CMakeLists.txt and edit it.
+#
+# USAGE: INCLUDE IN PROJECT
+#
+#  set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR})
+#  include(UseDoxygen)
+# Add the Doxyfile.in and UseDoxygen.cmake files to the projects source directory.
+#
+#
+# Variables you may define are:
+#  DOXYFILE_OUTPUT_DIR - Path where the Doxygen output is stored. Defaults to "doc".
+#
+#  DOXYFILE_LATEX_DIR - Directory where the Doxygen LaTeX output is stored. Defaults to "latex".
+#
+#  DOXYFILE_HTML_DIR - Directory where the Doxygen html output is stored. Defaults to "html".
+#
+
+#
+#  Copyright (c) 2009 Tobias Rautenkranz <tobias@rautenkranz.ch>
+#
+#  Redistribution and use is allowed according to the terms of the New
+#  BSD license.
+#  For details see the accompanying COPYING-CMAKE-SCRIPTS file.
+#
+
+macro(usedoxygen_set_default name value)
+	if(NOT DEFINED "${name}")
+		set("${name}" "${value}")
+	endif()
+endmacro()
+
+find_package(Doxygen)
+
+if(DOXYGEN_FOUND)
+	find_file(DOXYFILE_IN "Doxyfile.in"
+			PATHS "${CMAKE_CURRENT_SOURCE_DIR}" "${CMAKE_ROOT}/Modules/")
+
+	include(FindPackageHandleStandardArgs)
+	find_package_handle_standard_args(Doxyfile.in DEFAULT_MSG DOXYFILE_IN)
+endif()
+
+if(DOXYGEN_FOUND AND DOXYFILE_IN)
+	add_custom_target(doxygen ${DOXYGEN_EXECUTABLE} ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile)
+
+	usedoxygen_set_default(DOXYFILE_OUTPUT_DIR "${CMAKE_CURRENT_BINARY_DIR}/doc")
+	usedoxygen_set_default(DOXYFILE_HTML_DIR "html")
+
+	set_property(DIRECTORY APPEND PROPERTY
+			ADDITIONAL_MAKE_CLEAN_FILES "${DOXYFILE_OUTPUT_DIR}/${DOXYFILE_HTML_DIR}")
+
+	set(DOXYFILE_LATEX "NO")
+	set(DOXYFILE_PDFLATEX "NO")
+	set(DOXYFILE_DOT "NO")
+
+	find_package(LATEX)
+	if(LATEX_COMPILER AND MAKEINDEX_COMPILER)
+		set(DOXYFILE_LATEX "YES")
+		usedoxygen_set_default(DOXYFILE_LATEX_DIR "latex")
+
+		set_property(DIRECTORY APPEND PROPERTY
+				ADDITIONAL_MAKE_CLEAN_FILES
+				"${DOXYFILE_OUTPUT_DIR}/${DOXYFILE_LATEX_DIR}")
+
+		if(PDFLATEX_COMPILER)
+			set(DOXYFILE_PDFLATEX "YES")
+		endif()
+		if(DOXYGEN_DOT_EXECUTABLE)
+			set(DOXYFILE_DOT "YES")
+		endif()
+
+		add_custom_command(TARGET doxygen
+			POST_BUILD
+			COMMAND ${CMAKE_MAKE_PROGRAM}
+			WORKING_DIRECTORY "${DOXYFILE_OUTPUT_DIR}/${DOXYFILE_LATEX_DIR}")
+	endif()
+
+
+	configure_file(${DOXYFILE_IN} Doxyfile ESCAPE_QUOTES IMMEDIATE @ONLY)
+
+	get_target_property(DOC_TARGET doc TYPE)
+	if(NOT DOC_TARGET)
+		add_custom_target(doc)
+	endif()
+		
+	add_dependencies(doc doxygen)
+endif()