cli-parser (#4)

Goal of this PR should be to integrate a working CLI parser so that commands can be sent to the Printer class to print text, such as
ptprnt -t=FooBar
also, standard flags for setting the output verbosity and help should be implemented

Reviewed-on: #4

src/libusbwrap/UsbDeviceFactory.cpp

@@ -29,10 +29,11 @@
 #include "libusbwrap/interface/IUsbDevice.hpp"
 
 namespace libusbwrap {
-UsbDeviceFactory::UsbDeviceFactory() {}
 
 UsbDeviceFactory::~UsbDeviceFactory() {
-    libusb_free_device_list(mLibusbDeviceList, 1);
+    if (mDeviceListInitialized) {
+        libusb_free_device_list(mLibusbDeviceList, 1);
+    }
 }
 
 std::vector<std::shared_ptr<IUsbDevice>> UsbDeviceFactory::findAllDevices() {
@@ -52,7 +53,7 @@ int UsbDeviceFactory::refreshDeviceList() {
     } else if (ret == 0) {
         spdlog::warn("No USB devices found");
     }
-
+    mDeviceListInitialized = true;
     return ret;
 }