Migrate core source files to C++. Add yaml-cpp project as dependency (#2207)

By updating to this commit, Linux users have to regenerate Makefiles by re-running the configure script.

* Added yaml-cpp project as a 3rdparty library
* Migrated source files core to C++
* Updated configure scripts
* Make Linux installations compile *.cpp files
* Made server components' main source file C++
* Also made headers CPP-aware.

* Added basic C wrapper for yaml-cpp library
* YAML-node path is delimited by periods.
* Basic integer types and string are supported.
* Strings returned from this wrapper have to be freed with malloc.h::aFree
* Arrays (sequence) is supported with iterator wrapper.
* Remember to free every wrapper you create!

* Add yaml-cpp as dependency of common project
* Made the repo not ignore *.yml files

Thanks to @aleos89 and @Lemongrass3110.

3rdparty/yaml-cpp/src/exceptions.cpp

@@ -0,0 +1,19 @@
+#include "yaml-cpp/exceptions.h"
+
+namespace YAML {
+
+// These destructors are defined out-of-line so the vtable is only emitted once.
+Exception::~Exception() NOEXCEPT {}
+ParserException::~ParserException() NOEXCEPT {}
+RepresentationException::~RepresentationException() NOEXCEPT {}
+InvalidScalar::~InvalidScalar() NOEXCEPT {}
+KeyNotFound::~KeyNotFound() NOEXCEPT {}
+InvalidNode::~InvalidNode() NOEXCEPT {}
+BadConversion::~BadConversion() NOEXCEPT {}
+BadDereference::~BadDereference() NOEXCEPT {}
+BadSubscript::~BadSubscript() NOEXCEPT {}
+BadPushback::~BadPushback() NOEXCEPT {}
+BadInsert::~BadInsert() NOEXCEPT {}
+EmitterException::~EmitterException() NOEXCEPT {}
+BadFile::~BadFile() NOEXCEPT {}
+}