MEDIUM: stick-table: add the new array of gpt data_type

MEDIUM: stick-table: add the new array of gpt data_type

This patch adds the definition of a new array data_type
'gpt'. This is an array of 32bits General Purpose Tags.

Like for all arrays, it is limited to 100 elements.

This patch also adds actions and fetches to handle
elements of this array.

Note: As documented, those new actions and fetches won't
apply to the legacy 'gpt0' data type.