In-app flash write, UF2 parser, remove picotool dependency, reboot command

lib/client/client.go

@@ -117,6 +117,21 @@ func (c *Client) Log() (*ResponseLog, error) {
 	return first(roundTrip[ResponseLog](c, &RequestLog{}))
 }
 
+func (c *Client) FlashErase(addr, length uint32) error {
+	_, err := first(roundTrip[ResponseFlashErase](c, &RequestFlashErase{Addr: addr, Len: length}))
+	return err
+}
+
+func (c *Client) FlashWrite(addr uint32, data []byte) error {
+	_, err := first(roundTrip[ResponseFlashWrite](c, &RequestFlashWrite{Addr: addr, Data: data}))
+	return err
+}
+
+func (c *Client) Reboot() error {
+	_, err := first(roundTrip[ResponseReboot](c, &RequestReboot{}))
+	return err
+}
+
 func (c *Client) ListTests() (*ResponseListTests, error) {
 	return first(roundTrip[ResponseListTests](c, &RequestListTests{}))
 }