StableLCD 1.2.0

- Added LCD DDRAM text reading functions:
  - read()
  - readLine()
  - readUntil()

- Added logical position and address helper functions:
  - getCols()
  - getRows()
  - getPos()
  - getLine()
  - getAddress()
  - setAddress()

- Added DEMO6_ReadFunctions example

- Expanded README documentation for:
  - reading display memory
  - text parsing
  - separator handling
  - logical cursor/address handling

- Updated keywords.txt with new API functions
