Addition of API methods in header

[LittleDan9]

I have recently been working on a project that utilizes multiple different display drivers that utilize this library as the primary writing routine. To chose the display driver a runtime I am using the Adafruit_GFX library as an interface to these TFT drivers. Both the of TFT driver I am utilize implement the begin, setAddrWindow, pushColor and color565 methods. To be able to utilize Adafruit_GFX as the interface I am requesting the following be added to the header:

virtual void begin(void)=0;
virtual void setAddrWindow(uint16_t x, uint16_t y, uint16_t w, uint16_t h)=0;
virtual void pushColor(uint16_t color)=0;
virtual uint16_t color565(uint8_t r, uint8_t g, uint8_t b)=0;

Not sure if update requests can be made or if there is a process you would like use to follow.