Add CMake build system

Add CMake build system for libraries, tests and samples
update_files.py converts build/files into CMake format.
build/update-setup-h has been modified to update build/cmake/setup.h.in.

build/cmake/policies.cmake

@@ -0,0 +1,48 @@
+#############################################################################
+# Name:        CMakeLists.txt
+# Purpose:     CMake policies for wxWidgets
+# Author:      Tobias Taschner
+# Created:     2016-10-21
+# Copyright:   (c) 2016 wxWidgets development team
+# Licence:     wxWindows licence
+#############################################################################
+
+if(POLICY CMP0025)
+	# Compiler id for Apple Clang is now AppleClang
+	cmake_policy(SET CMP0025 NEW)
+endif()
+
+if(POLICY CMP0038)
+	# targets may not link directly to themselves
+	cmake_policy(SET CMP0038 NEW)
+endif()
+
+if(POLICY CMP0045)
+	# error on non-existent target in get_target_property
+	cmake_policy(SET CMP0045 NEW)
+endif()
+
+if(POLICY CMP0046)
+	# error on non-existent dependency in add_dependencies
+	cmake_policy(SET CMP0046 NEW)
+endif()
+
+if(POLICY CMP0049)
+	# do not expand variables in target source entries
+	cmake_policy(SET CMP0049 NEW)
+endif()
+
+if(POLICY CMP0053)
+	# simplify variable reference and escape sequence evaluation
+	cmake_policy(SET CMP0053 NEW)
+endif()
+
+if(POLICY CMP0054)
+	# only interpret if() arguments as variables or keywords when unquoted
+	cmake_policy(SET CMP0054 NEW)
+endif()
+
+if(POLICY CMP0042)
+	# MACOSX_RPATH is enabled by default.
+	cmake_policy(SET CMP0042 NEW)
+endif()