Added additional macros/constants to sys/lcd.h and created sys/spi.h

[ZERICO2005]

I wanted to add some additional macros/constants to sys/lcd.h; such as being able to set RGB/BGR and Bits per pixel with lcd_VideoMode = LCD_BGR565 using the lower 16bits of lcd_Control, or just the Bits per pixel using lcd_VideoBPP = LCD_INDEXED8 to set the lower 8bits of lcd_Control.

Additionally, I thought it would be nice to add #define lcd_Ram8 ((uint8_t*)0xD40000) and #define lcd_Ram16 ((uint16_t*)0xD40000) to sys/lcd.h.

I also added sys/spi.h, which contains #define's for the SPI registers, along with some macro routines to send SPI commands and parameters (based of the SPI sending example from WikiTI). There are also some macros for Inverting the colors, and for setting Row-Major/Column-Major through the SPI commands.