Game bar (#392)

* Fix games with custom touch control sometimes not showing touch icon

* Create game-bar with screenshot button

* Disable Game bar when opening the Guide

* Remove SCREENSHOT_BUTTON_POSITION pref

* Make the touch control action functional

* Show game bar when the game starts

* Fix 720p/High not working (#387)

* Update icons

* Update game bar's animations

* Reset states of Game bar actions before playing

* Don't show Touch control action on non-touch-supported devices

* Clean up

* Update translations

* Update actions' texts

* Clean up

src/assets/css/game-bar.styl

@@ -0,0 +1,91 @@
+#bx-game-bar {
+    z-index: var(--bx-game-bar-z-index);
+    position: fixed;
+    left: 0;
+    bottom: 0;
+    width: 40px;
+    height: 90px;
+    overflow: visible;
+    cursor: pointer;
+
+    > svg {
+        display: none;
+        pointer-events: none;
+        position: absolute;
+        height: 28px;
+        margin-top: 16px;
+    }
+
+    @media (hover: hover) {
+        &:hover {
+            > svg {
+                display: block;
+            }
+        }
+    }
+
+    .bx-game-bar-container {
+        opacity: 0;
+        position absolute;
+        display: flex;
+        overflow: hidden;
+        background: #1a1b1ee8;
+        border-radius: 0 10px 10px 0;
+        box-shadow: 0px 0px 6px #1c1c1c;
+        transition: opacity 0.1s ease-in;
+
+        &.bx-show {
+            opacity: 1;
+
+            + svg {
+                display: none !important;
+            }
+        }
+
+        &.bx-hide {
+            opacity: 0;
+        }
+
+        button {
+            width: 60px;
+            height: 60px;
+
+            svg {
+                width: 28px;
+                height: 28px;
+                transition: transform 0.08s ease 0s;
+            }
+
+            &:hover {
+                border-radius: 0;
+            }
+
+            &:active {
+                svg {
+                    transform: scale(0.75);
+                }
+            }
+        }
+
+        /* Touch controller buttons */
+        div[data-enabled] {
+            button {
+                display: none;
+            }
+        }
+
+        /* Show disable button */
+        div[data-enabled='true'] {
+            button:last-of-type {
+                display: block;
+            }
+        }
+
+        /* Show enable button */
+        div[data-enabled='false'] {
+            button:first-of-type {
+                display: block;
+            }
+        }
+    }
+}