Correct #263, add setup file for 160x80 TFT, add invert option

Fixed bug where wrong wodth was returned for 1bpp Sprite
Improved speed for copying a 1bpp Sprite into another 1bpp Sprite (
affects Sprite pushImage() function only)
Added option to setup for colour inversion

TFT_eSPI.cpp

@@ -366,6 +366,14 @@ void TFT_eSPI::init(uint8_t tc)
 
 #endif
 
+#ifdef TFT_INVERSION_ON
+  writecommand(TFT_INVON);
+#endif
+
+#ifdef TFT_INVERSION_OFF
+  writecommand(TFT_INVOFF);
+#endif
+
   spi_end();
 
   setRotation(rotation);