OutputStream (file M0 -> M4 radio) now works

Disabled numbers station for now (too buggy, low priority)

firmware/common/buffer_exchange.cpp

@@ -56,9 +56,7 @@ BufferExchange::~BufferExchange() {
 StreamBuffer* BufferExchange::get(FIFO<StreamBuffer*>* fifo) {
 	while(true) {
 		StreamBuffer* p { nullptr };
-		fifo->out(p);	// This crashes replay
-		
-		//led_tx.on();	// DEBUG
+		fifo->out(p);
 		
 		if( p ) {
 			return p;

firmware/common/message.hpp

@@ -484,6 +484,10 @@ public:
 	size_t size() const {
 		return used_;
 	}
+	
+	size_t capacity() const {
+		return capacity_;
+	}
 
 	void set_size(const size_t value) {
 		used_ = value;