Draft: Add version property to AT-SPI interfaces
It is currently impossible to negotiate additions to the AT-SPI interfaces: if a new symbol is added (property, signal, or method), or a new member is added to an enumeration, there's no way for toolkits to communicate that information to the ATs.
Starting from this point, any addition to the existing interfaces will result in the version property being increased by one.
Fixes: #188
Edited by Emmanuele Bassi