Added custom icons, load from favicon, load from theme-color

Author: AlexTorresDev

example/assets/icons.json

@@ -0,0 +1,10 @@
+{
+    "check": "<svg viewBox='0 0 11 11'><path d='M3.8,9.3c-0.1,0-0.2,0-0.3-0.1L0.2,5.8C0,5.6,0,5.4,0.2,5.2C0.4,5,0.7,5,0.9,5.2l3,3l6.3-6.3c0.2-0.2,0.5-0.2,0.7,0C11,2,11,2.3,10.8,2.5L4.2,9.1C4.1,9.2,4,9.3,3.8,9.3z'/></svg>",
+    "arrow": "<svg viewBox='0 0 11 11'><path d='M3.1,10.7c-0.1,0-0.2,0-0.3-0.1c-0.2-0.2-0.2-0.5,0-0.7l4.4-4.4L2.8,1.1c-0.2-0.2-0.2-0.5,0-0.7c0.2-0.2,0.5-0.2,0.7,0l4.8,4.8c0.2,0.2,0.2,0.5,0,0.7l-4.8,4.8C3.4,10.7,3.2,10.7,3.1,10.7z'/></svg>",
+    "win": {
+        "minimize": "<svg viewBox='0 0 11 11'><path d='M11,4.9v1.1H0V4.399h11z'/></svg>",
+        "maximize": "<svg viewBox='0 0 11 11'><path d='M0,1.7v7.6C0,10.2,0.8,11,1.7,11h7.6c0.9,0,1.7-0.8,1.7-1.7V1.7C11,0.8,10.2,0,9.3,0H1.7C0.8,0,0,0.8,0,1.7z M8.8,9.9H2.2c-0.6,0-1.1-0.5-1.1-1.1V2.2c0-0.6,0.5-1.1,1.1-1.1h6.7c0.6,0,1.1,0.5,1.1,1.1v6.7C9.9,9.4,9.4,9.9,8.8,9.9z'/></svg>",
+        "restore": "<svg viewBox='0 0 11 11'><path d='M7.9,2.2h-7C0.4,2.2,0,2.6,0,3.1v7C0,10.6,0.4,11,0.9,11h7c0.5,0,0.9-0.4,0.9-0.9v-7C8.8,2.6,8.4,2.2,7.9,2.2z M7.7,9.6 c0,0.2-0.1,0.3-0.3,0.3h-6c-0.2,0-0.3-0.1-0.3-0.3v-6c0-0.2,0.1-0.3,0.3-0.3h6c0.2,0,0.3,0.1,0.3,0.3V9.6z'/><path d='M10,0H3.5v1.1h6.1c0.2,0,0.3,0.1,0.3,0.3v6.1H11V1C11,0.4,10.6,0,10,0z'/></svg>",
+        "close": "<svg viewBox='0 0 11 11'><path d='M6.279 5.5L11 10.221l-.779.779L5.5 6.279.779 11 0 10.221 4.721 5.5 0 .779.779 0 5.5 4.721 10.221 0 11 .779 6.279 5.5z'/></svg>"
+    }
+}