Changes to add a max6675 thermocouple amp for Type K, and added and OLED for display

[dmandala]

Switched to an Arduino Nano base, added a switch, changed from a 1Wire Type K to a SPI, max 6675 Type K, added a .96" cheap OLED and changed how profiles are stored.

1. Removed the one wire temp reader and swapped in a type K thermocouple
   and a max6675 thermocouple amp.

2. Removed the single button input method and replaced it with two
   buttons on hardware INT lines (pins 2-3 on an Arduino NANO).

3. Dropped the LED blinking to tell you what profile selected with a
   small OLED display. The display is a The OLED hardware is based on "0.96
   Inch OLED Module 12864 128x64 Yellow Blue SSD1306 Driver I2C Serial
   Self-Luminous Display Board" the Module Size: 27mmx 27mm x 4mm.

4. The a major change was to remove functions to set up a profile and
   replace it with an array of arrays, so it removes a bunch of if clauses
   and just uses a single offset into the array that is changed from stage
   to stage. The actual PID code was not changed beyond that, I don't
   understand PID code enough that I'm willing to change it without
   guidance of the author.

5. The file was split up into 4 files to make it a bit easier to see
   what functions are what, the files are display.ino, handle_input, temp
   and the original file toastyOven.

5a) The display.ino handles the Serial.print output, and the OLED display
subsystem.

5b) The handle_input.ino handles the 2 buttons, on the hardware interrupt
pins specific to the Arduino hardware, In my case I am using an Arduino
Nano and its int pins are 2 and 3 but on a different Arduino you might
have to move the switches to different hardware pins.

5c) The temp.ino takes care of reading the temp via what ever hardware
you are using to track the temp in the oven. In my case I'm using a
thermocouple that is of type K and an associated thermocouple amp, which
again in my case is a max6675.

5d) The multiprofileTypeK.ino now for the most part contains the oven thermal
control PID system, and the section to select the profile you want to
run.

[dmandala]

Added a fritzing file and a png of the wiring. Also made some changes to how the SSD's were wired, moved the pins to the PWM pins on the Nano and finally made some changes to the read temp function for clarity on timing issues.