Update data & types (new `partOf`, `userAssigned` params)

[dmythro]

Issues:

• [x] #36
• [x] #131
• [x] #132
• [x] #134

Data changes verified with:

• https://en.wikipedia.org/wiki/Åland
• https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2#User-assigned_code_elements

Quotes from current documents:

Åland is an autonomous and demilitarised region of Finland.

User-assigned code elements are codes at the disposal of users who need to add further names of countries, territories, or other geographical entities to their in-house application of ISO 3166-1, and the ISO 3166/MA will never use these codes in the updating process of the standard. The following alpha-2 codes can be user-assigned: AA, QM to QZ, XA to XZ, and ZZ.

The code XK is being used by the European Commission the IMF, and SWIFT, the CLDR, and other organizations as a temporary country code for Kosovo.