Merge commit '83e0dd40633f4d5a56b74c33e2d1d18b66c4bd7d' as 'extern/LuaBridge'

Author: vieiraa

extern/LuaBridge/.gitattributes

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+* text=auto

extern/LuaBridge/.gitignore

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+Documentation
+*.swp
+Makefile
+CMakeCache.txt
+CMakeFiles/
+*.dir/
+*.cmake
+*.sln
+*.vcxproj
+*.vcxproj.filters
+*.vcxproj.user
+.vs/
+.vscode

extern/LuaBridge/.gitmodules

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+[submodule "third_party/gtest"]
+	path = third_party/gtest
+	url = https://github.com/google/googletest.git

extern/LuaBridge/CHANGES.md

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+## Version 2.5
+
+* Introduce isInstance method and a convenience function template.
+
+## Version 2.4.1
+
+* Do not call the object destructor then its constructor throws.
+
+## Version 2.4
+
+* String stack get specialization doesn't change the stack value anymore.
+* Added namespace addProperty accepting C-functions.
+* Introduce enableExceptions function.
+
+## Version 2.3.2
+
+* Fixed registration continuation for already registered class.
+
+## Version 2.3.1
+
+* Fixed registration continuation issues.
+
+## Version 2.3
+
+* Added class addFunction accepting proxy functions (C++11 only).
+* Added class addFunction accepting std::function (C++11 only).
+* Added class addProperty accepting functions with lua_State* parameter.
+* Added class addProperty accepting std::function (C++11 only).
+* Added stack traits for std::unordered_map (UnorderedMap.h).
+* Now using lightuserdata for function pointers.
+
+## Version 2.2.2
+
+* Performance optimization.
+
+## Version 2.2.1
+
+* Refactored namespace and class handling.
+
+## Version 2.2
+
+* Refactored stack operations.
+* Handle exceptions in stack operations.
+
+## Version 2.1.2
+
+* Added operator== and operator!= for RefCountedPtr template.
+
+## Version 2.1.1
+
+* Support for __stdcall function pointers.
+
+## Version 2.1
+
+* Added stack traits for std::vector (Vector.h), std::list (List.h) and std::map (Map.h).
+* Added ability to use LuaRef objects as an std::map keys.
+* Fixed some manual errata.
+
+## Version 2.0
+
+* Numerous bug fixes
+* Feature Requests from Github Issues
+* Added LuaRef object
+* Rewritten documentation
+
+## Version 1.1.0
+
+* Split code up into several files
+* Add Lua table and type representations (based on Nigel's code)
+* Reformat documentation as external HTML file
+
+## Version 1.0.3
+
+* Pass nil to Lua when a null pointer is passed for objects with shared lifetime.
+
+## Version 1.0.2
+
+* Option to hide metatables selectable at runtime, default to true.
+* addStaticMethod () renamed to addStaticFunction () for consistency.
+* addMethod () renamed to addFunction() for consistency.
+* addCFunction () registrations.
+* Convert null pointers to and from nil.
+* Small performance increase in class pointer extraction.
+
+## Version 1.0.1
+
+* Backward compatibility with Lua 5.1.x.
+
+## Version 1.0
+
+* Explicit lifetime management models.
+* Generalized containers.
+* Single header distribution.

extern/LuaBridge/CMakeLists.txt

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+cmake_minimum_required (VERSION 3.5)
+
+project (LuaBridge)
+
+include (CMakeDependentOption)
+
+set (CMAKE_CXX_STANDARD 11)
+
+option (LUABRIDGE_NO_CXX11 "Use C++11 standard if supported by compiler" OFF)
+
+cmake_dependent_option (LUABRIDGE_TESTING "Build tests" ON
+  "CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR" OFF)
+
+if (LUABRIDGE_NO_CXX11)
+  add_definitions (-DLUABRIDGE_NO_CXX11)
+endif ()
+
+add_subdirectory (Source)
+
+if (LUABRIDGE_TESTING)
+    set (gtest_force_shared_crt ON CACHE BOOL "Use /MD and /MDd" FORCE)
+    add_subdirectory (third_party/gtest)
+
+    add_subdirectory (Tests)
+endif ()
+
+add_custom_target (Documentation SOURCES
+    CHANGES.md
+    README.md
+    Doxyfile
+    index.html
+    Manual.html
+)