Update input_handlers.py

[lingawakad]

In v12.3, SDL2 changed Key constants to enums e.g. tcod.event.K_UP should be replaced with tcod.event.KeySym.UP

Seems like it's not a problem yet, but errors popping up can be frightening:

FutureWarning: Key constants have been replaced with enums. 'tcod.event.K_UP' should be replaced with 'tcod.event.KeySym.UP'

I changed all the branches, but that seems like a lot of PRs - pls lmk the best way to do that, i'm still a git noob.

[HexDecimal]

You propagate changes by merging them into the subsequent part branches and then into the master branch. This is tedious but it at least means you'd only have to edit the branches where key constants are actually added.

I can probably work with what you have now and merge it.

[HexDecimal]

The main issue is that the roguelike tutorials website isn't being updated at the moment. So I'm not sure how to push the changes there.

[lingawakad]

The main issue is that the roguelike tutorials website isn't being updated at the moment. So I'm not sure how to push the changes there.

Yeah, but at least it's in the source i guess.

I can push the changes in part-6 as well, it looks like that should cover most of it. or all 13 parts.

[HexDecimal]

The changes have to be propagated across subsequent parts which all have to be merged. You only need this one PR to show that your changes are ready.

I'm going to wait for TStand90/roguelike-tutorials-website#40 to be closed before I work on this.