Added CMake build.

Code changes to support Linux.
Updated documentation & README.md, which were sorely out of date.
Updated copyrights. *yawn*

CMakeLists.txt

@@ -0,0 +1,45 @@
+# tmx2gba - CMakeLists.txt
+# Copyright (C) 2018 Nicholas Curtis (a dinosaur)
+#
+# This software is provided 'as-is', without any express or implied
+# warranty.  In no event will the authors be held liable for any damages
+# arising from the use of this software.
+#
+# Permission is granted to anyone to use this software for any purpose,
+# including commercial applications, and to alter it and redistribute it
+# freely, subject to the following restrictions:
+#
+# 1. The origin of this software must not be misrepresented; you must not
+#    claim that you wrote the original software. If you use this software
+#    in a product, an acknowledgment in the product documentation would be
+#    appreciated but is not required.
+# 2. Altered source versions must be plainly marked as such, and must not be
+#    misrepresented as being the original software.
+# 3. This notice may not be removed or altered from any source distribution.
+
+cmake_minimum_required(VERSION 3.10)
+project(tmx2gba)
+
+set(CMAKE_CXX_STANDARD 11)
+
+include_directories(inc)
+set(SOURCES
+	src/tmx2gba.cpp
+	src/tmxlayer.cpp	src/tmxlayer.h
+	src/tmxobject.cpp	src/tmxobject.h
+	src/tmxreader.cpp	src/tmxreader.h
+	src/tmxtileset.cpp	src/tmxtileset.h
+
+	src/base64.cpp		inc/base64.h
+	inc/miniz.h
+
+	inc/rapidxml/rapidxml.hpp
+	inc/rapidxml/rapidxml_iterators.hpp
+	inc/rapidxml/rapidxml_print.hpp
+	inc/rapidxml/rapidxml_utils.hpp)
+
+if (MSVC)
+	set(SOURCES ${SOURCES} src/XGetopt.cpp inc/XGetopt.h)
+endif()
+
+add_executable(tmx2gba ${SOURCES})