feat: add basic POC support for kitty multi cursor protocol

src/renderer/vaxis/renderer.zig

@@ -382,6 +382,11 @@ pub fn process_renderer_event(self: *Self, msg: []const u8) Error!void {
             self.vx.caps.rgb = true;
         },
         .cap_color_scheme_updates => {},
+
+        .cap_multi_cursor => {
+            self.logger.print("multi cursor capability detected", .{});
+            self.vx.caps.multi_cursor = true;
+        },
     }
 }
 
@@ -535,6 +540,14 @@ pub fn cursor_disable(self: *Self) void {
     self.vx.screen.cursor_vis = false;
 }
 
+pub fn clear_all_multi_cursors(self: *Self) !void {
+    try self.tty.anyWriter().print("\x1b[>0;4 q", .{});
+}
+
+pub fn show_multi_cursor_yx(self: *Self, y: c_int, x: c_int) !void {
+    try self.tty.anyWriter().print("\x1b[>-1;2:{d}:{d} q", .{ y + 1, x + 1 });
+}
+
 fn sync_mod_state(self: *Self, keypress: u32, modifiers: vaxis.Key.Modifiers) !void {
     if (modifiers.ctrl and !self.mods.ctrl and !(keypress == input.key.left_control or keypress == input.key.right_control))
         try self.send_sync_key(input.event.press, input.key.left_control, "", modifiers);