In effect, this is a combination of two of the previous pickers:
the location picker, and the editable string picker.
This required quite a significant rework of how the tilemap places its children.
Currently it's only used in special node editing.
I plan to add its use in many other places too though.
It's used not only in special node editing (for Event Happens and If Event Happened?)
but also in the Townperson Advanced, Talk Node, and Quest editors.
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.
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.
