Updated ST7565 library

I have made a few changes to my ST7565 library, available from GitHub. Firstly the configuration is now broken out into a new file, so that st7565.h and st7565.c can be overwritten when the library updates without interfering with port settings. A quick fix is included for the dogm displays which appear to reverse the screen in a different way to the previous screen I tested. I will do a full review of the rather nice dogm module at a later date.