[feat] update some feature

sync code of  fastrtc,
add text support through datachannel,
fix safari connect problem
support chat without camera or mic

frontend/shared/VideoChat/icons/IconFont.svelte

@@ -0,0 +1,13 @@
+<script lang="ts">
+  export let color;
+  export let fontSize = "16px";
+  export let icon: any = undefined;
+</script>
+
+<span style={`color: ${color}; font-size: ${fontSize}`}>
+  {#if icon}
+    <svelte:component this={icon} />
+  {:else}
+    <slot></slot>
+  {/if}
+</span>