UI: Option to automatically Hide UI when game launches (#462)

Quality of life feature
Similar in function to the "Start Games in Fullscreen" toggle
For users who want to run games in windowed/non-fullscreen mode with
menu UI hidden, this eliminates the need to always click "Hide UI"

src/Ryujinx/Assets/locales.json

@@ -572,6 +572,31 @@
         "zh_TW": "使用全螢幕模式啟動遊戲"
       }
     },
+    {
+      "ID": "MenuBarOptionsStartGamesWithoutUI",
+      "Translations": {
+        "ar_SA": "",
+        "de_DE": "",
+        "el_GR": "",
+        "en_US": "Start Games with UI Hidden",
+        "es_ES": "",
+        "fr_FR": "",
+        "he_IL": "",
+        "it_IT": "",
+        "ja_JP": "",
+        "ko_KR": "",
+        "no_NO": "",
+        "pl_PL": "",
+        "pt_BR": "",
+        "ru_RU": "",
+        "sv_SE": "",
+        "th_TH": "",
+        "tr_TR": "",
+        "uk_UA": "",
+        "zh_CN": "",
+        "zh_TW": ""
+      }
+    },
     {
       "ID": "MenuBarOptionsStopEmulation",
       "Translations": {