This PR adds a new, optional aspect to the Ancient Cave experience:
During their run, players can have the opportunity to purchase some additional items or spells to improve their party. If enabled, a shop will appear everytime a certain (configurable) number of floors in the dungeon has been completed. The shop inventories are generated randomly (taking into account player preference as well as a system to ensure that more expensive items can only become available deeper into the run).
For customization, 3 new options are introduced:
- `shop_interval`: Determines by how many floors the shops are separated (or keeps them turned off entirely)
- `shop_inventory`: Determines what's possible to be for sale. (Players can specify weights for general categories of things such as "weapon" or "spell" or even adjust the probabilities of individual items)
- `gold_modifier`: Determines how much gold is dropped by enemies. This is the player's only source of income and thus controls how much money they will have available to spend in shops
* Core: typing for async_start
* CommonClient: add a framework for clients to subscribe to data storage key notifications
* Core: update version to 0.4.2
* lufia2ac: coop support
el-u