Driver: Block between read attempts

Driver:

* Refactored to limit accessibility of member fields;

Communication:

* readTask() now calls for a blocking wait;

include/icsneo/platform/ftd3xx.h

@@ -22,8 +22,10 @@ public:
 private:
 	neodevice_t& device;
 	std::optional<void*> handle;
-	void readTask() override;
-	void writeTask() override;
+
+	std::thread readThread, writeThread;
+	void readTask();
+	void writeTask();
 };
 
 }