new icon: unrealengine (original, original-wordmark, plain, plain-wordmark) (#939)

* added unrealengine icons

* Changed viewbox size and optimized with inkscape

* Changed names and removed horizontal wordmark versions

* optimized with https://www.svgviewer.dev/

* added unrealengine to devicon.json

* fix #346

* Removed white logos, and renamed the other ones

* Changed color to #000000 and removed reference to deleted icons

* centered logo in viewbox

* optimized icon with svgviewer.dev

* Update devicon.json

Co-authored-by: David Leal <halfpacho@gmail.com>

* Update devicon.json

Co-authored-by: David Leal <halfpacho@gmail.com>

* Apply suggestions from code review

* Update devicon.json

Co-authored-by: David Leal <halfpacho@gmail.com>
Co-authored-by: Thomas Bui <43018778+Thomas-Boi@users.noreply.github.com>

Author: 3 people

devicon.json

@@ -4499,7 +4499,7 @@
                 "original-wordmark"
             ]
         },
-        "color": "#212b35",
+        "color": "#000000",
         "aliases": []
     },
     {
@@ -4518,6 +4518,35 @@
         "color": "#4051b5",
         "aliases": []
     },
+    {
+        "name": "unrealengine",
+        "tags": [
+            "c++",
+            "engine",
+            "game"
+        ],
+        "versions": {
+            "svg": [
+                "original",
+                "original-wordmark"
+            ],
+            "font": [
+                "original",
+                "original-wordmark"
+            ]
+        },
+        "color": "#000000",
+        "aliases": [
+            {
+                "base": "original",
+                "alias": "plain"
+            },
+            {
+                "base": "original-wordmark",
+                "alias": "plain-wordmark"
+            }
+        ]
+    },
     {
         "name": "uwsgi",
         "tags": [