removed unused methods(BeginPlay, Tick) and added rider plugin

Plugins/Developer/RiderLink/Source/RD/thirdparty/optional/COPYING

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Plugins/Developer/RiderLink/Source/RD/thirdparty/optional/README.md

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+# optional
+Single header implementation of `std::optional` with functional-style extensions and support for references.
+
+Clang + GCC: [![Linux Build Status](https://travis-ci.org/TartanLlama/optional.png?branch=master)](https://travis-ci.org/TartanLlama/optional)
+MSVC: [![Windows Build Status](https://ci.appveyor.com/api/projects/status/k5x00xa11y3s5wsg?svg=true)](https://ci.appveyor.com/project/TartanLlama/optional)
+
+`std::optional` is the preferred way to represent an object which may or may not have a value. Unfortunately, chaining together many computations which may or may not produce a value can be verbose, as empty-checking code will be mixed in with the actual programming logic. This implementation provides a number of utilities to make coding with `optional` cleaner.
+
+For example, instead of writing this code:
+
+```c++
+std::optional<image> get_cute_cat (const image& img) {
+    auto cropped = crop_to_cat(img);
+    if (!cropped) {
+      return std::nullopt;
+    }
+
+    auto with_tie = add_bow_tie(*cropped);
+    if (!with_tie) {
+      return std::nullopt;
+    }
+
+    auto with_sparkles = make_eyes_sparkle(*with_tie);
+    if (!with_sparkles) {
+      return std::nullopt;
+    }
+
+    return add_rainbow(make_smaller(*with_sparkles));
+}
+```
+
+You can do this:
+
+```c++
+tl::optional<image> get_cute_cat (const image& img) {
+    return crop_to_cat(img)
+           .and_then(add_bow_tie)
+           .and_then(make_eyes_sparkle)
+           .map(make_smaller)
+           .map(add_rainbow);
+}
+```
+
+Full documentation available at [optional.tartanllama.xyz](https://optional.tartanllama.xyz)
+
+The interface is the same as `std::optional`, but the following member functions are also defined. Explicit types are for clarity.
+
+- `map`: carries out some operation on the stored object if there is one.
+  * `tl::optional<std::size_t> s = opt_string.map(&std::string::size);`
+- `and_then`: like `map`, but for operations which return a `tl::optional`.
+  * `tl::optional<int> stoi (const std::string& s);`
+  * `tl::optional<int> i = opt_string.and_then(stoi);`
+- `or_else`: calls some function if there is no value stored.
+  * `opt.or_else([] { throw std::runtime_error{"oh no"}; });`
+- `map_or`: carries out a `map` if there is a value, otherwise returns a default value.
+  * `tl::optional<std::size_t> s = opt_string.map_or(&std::string::size, 0);`
+- `map_or_else`: carries out a `map` if there is a value, otherwise returns the result of a given default function.
+  * `std::size_t get_default();`
+  * `tl::optional<std::size_t> s = opt_string.map_or(&std::string::size, get_default);`
+- `conjunction`: returns the argument if a value is stored in the optional, otherwise an empty optional.
+  * `tl::make_optional(42).conjunction(13); //13`
+  * `tl::optional<int>){}.conjunction(13); //empty`
+- `disjunction`: returns the argument if the optional is empty, otherwise the current value.
+  * `tl::make_optional(42).disjunction(13); //42`
+  * `tl::optional<int>{}.disjunction(13); //13`
+- `take`: returns the current value, leaving the optional empty.
+  * `opt_string.take().map(&std::string::size); //opt_string now empty;`
+
+In addition to those member functions, optional references are also supported:
+
+```c++
+int i = 42;
+tl::optional<int&> o = i;
+*o == 42; //true
+i = 12;
+*o = 12; //true
+&*o == &i; //true
+```
+
+Assignment has rebind semantics rather than assign-through semantics:
+
+```c++
+int j = 8;
+o = j;
+
+&*o == &j; //true
+```
+
+### Compiler support
+
+Tested on:
+
+
+- Linux
+  * clang 6.0.1
+  * clang 5.0.2
+  * clang 4.0.1
+  * clang 3.9
+  * clang 3.8
+  * clang 3.7
+  * clang 3.6
+  * clang 3.5
+  * g++ 8.0.1
+  * g++ 7.3
+  * g++ 6.4
+  * g++ 5.5
+  * g++ 4.9
+  * g++ 4.8
+- Windows
+  * MSVC 2015
+  * MSVC 2017
+
+### Dependencies
+
+Requires [Standardese](https://github.com/foonathan/standardese) for generating documentation.
+
+Requires [Catch](https://github.com/philsquared/Catch) for testing. This is bundled in the test directory.
+
+### Standards Proposal
+
+This library also serves as an implementation of WG21 standards paper [P0798R0: Monadic operations for std::optional](https://wg21.tartanllama.xyz/monadic-optional). This paper proposes adding `map`, `and_then`, and `or_else` to `std::optional`.
+
+----------
+
+[![CC0](http://i.creativecommons.org/p/zero/1.0/88x31.png)]("http://creativecommons.org/publicdomain/zero/1.0/")
+
+To the extent possible under law, [Simon Brand](https://twitter.com/TartanLlama) has waived all copyright and related or neighboring rights to the `optional` library. This work is published from: United Kingdom.