This just implements the guts of the dialog, without using it for anything yet.
It also fixes a bug that caused a blank page to appear in the string picker if the total number of strings was an exact multiple of 40.
Closes#563
With the new format, Author and Contact info are formatted onto the first line in the scenario picker display. The scenario designer gets 1 line to write a teaser.
Fix#593
Also fix a bug where scenario ratings were appearing as integers ingame instead of the correct "G", "PG", etc.
* Scenarios contain a string map of feature flags. The flag names are the keys, and flag versions are the values, so a typical value might be "fixed" for bug fixes or for evolving features, "V1", "V2", etc.
* The game has a map of flags to lists of supported versions. The game can therefore signal that it supports a legacy behavior for a given feature flag. The last version in the list is considered to be this build version's default behavior.
* When launching a scenario, we check to make sure the game supports the scenario's required versions of its feature flags.
* When launching a replay, we make sure the game supports the feature flags that the version of the game that made the recording did.
Fix#555Close#591
Better editing for talk node keys
* The fields start out empty, and it is *allowed* to keep *one of them* empty. (A node only needs one key to be useful, right?
* When the node is saved, empty strings are replaced with `" "`. If this is not harmless to the game logic, then I'll need to make the game aware that either key might be `" "`.
* You cannot type more than 4 characters in these fields (unless there's a way to insert characters I'm not aware of).
* If you put 'buy' in a field, it automatically becomes 'purc'.
* There is a note next to the response keys (kind of squished in the corner) enumerating the special logic of the in-game Buy and Sell buttons.
Refactor Debug Keys
* Collect debug keys into a central location so that the debug help dialog can automatically list every defined debug key.
* Add buttons so that debug actions can be taken directly from the debug help dialog.
* Add new debug keys to immediately fight an encounter from the current outdoor section.
