v3.0.0 - Tile structs

• Simplifies the API by using a tile struct instead of uint8_t
• Can now access tile data directly instead of via functions
• Breaks code that uses those functions, should update to access values directly

Version 2.0.0 - C++-interface

Adds a C++-interface that allows you to use libminesweeper in an object-oriented, C++14-fashion.

Breaking changes in the C-interface:
minesweeper_game struct now has a field called user_info. This is a void * that can be used to pass additional information to the tile change callback functions.

Version 1.0.0

The library has now been stability tested for some time. This gave some insights on its previous shortcoming and inconsistencies.

v1.0.0 marks an improved, more consistent API, with some new functionality and optimisations.