fonts, SVGs, and LESS updates for System Menu overlay

game/less/lib/fonts.less

@@ -0,0 +1,14 @@
+@font-face {
+  font-family: 'Big Pixel';
+  src: url('../../assets/fonts/BigPixel.otf');
+}
+
+@font-face {
+  font-family: 'Mono Regular';
+  src: url('../../assets/fonts/MonoRegular.ttf');
+}
+
+@font-face {
+  font-family: 'Larabie';
+  src: url('../../assets/fonts/LarabieFont.otf');
+}

game/less/lib/navbar.less

@@ -0,0 +1,3 @@
+.navbar {
+  padding: var(--default-margin) 0;
+}

game/less/lib/system-menu.less

@@ -0,0 +1,52 @@
+.menu-overlay#system-menu {
+  background-color: blue;
+  font-family: 'Mono Regular', monospace;
+
+  div.os-info {
+    display: block;
+    position: absolute;
+    top: 8px;
+    left: 8px;
+    width: calc(100% - 16px);
+
+    font-size: 20px;
+    font-weight: bold;
+
+    color: lightgray;
+
+    .os-version {
+      position: absolute;
+      left: 0;
+    }
+    .game-sdk-version {
+      position: absolute;
+      right: 0;
+    }
+    .game-description {
+      position: absolute;
+      left: 0; right: 0;
+      width: 100%;
+      text-align: center;
+      overflow: visible;
+    }
+  }
+
+  img.nice-cartdridge-icon {
+    display: block;
+    width: 100%;
+    max-width: 240px;
+    height: auto;
+    margin: 0 auto;
+  }
+
+  button.menu-button#boot-button {
+    background: none;
+    color: lightgray;
+    border: none;
+    font-family: inherit;
+
+    img {
+      margin-bottom: 12px;
+    }
+  }
+}