Changed CurrentTime to a static variable and added function for getting the current time instead

Global variables are really bad practice and should be avoided

right/src/usb_commands/usb_command_get_device_property.c

@@ -69,7 +69,7 @@ void UsbCommand_GetDeviceProperty(void)
             SetUsbTxBufferUint32(6, I2cMainBusActualBaudRateBps);
             break;
         case DevicePropertyId_Uptime:
-            SetUsbTxBufferUint32(1, CurrentTime);
+            SetUsbTxBufferUint32(1, Timer_GetCurrentTime());
             break;
         default:
             SetUsbTxBufferUint8(0, UsbStatusCode_GetDeviceProperty_InvalidProperty);