Improve offset, column and row address calculations

• Improved offset, column and row address calculations to be based on the display size.
• Moved rotate() to base SSD1327 class.
• Removed unused external_vcc argument.
• Removed unused import time.
• Gave show a tiny speed boost by using existing column and row addresses calculated on init.
• Added framebuf.line support.
• Deprecated WS_OLED_128X128