On screen logging

[mdales]

At the moment any debug information is sent to stdout via Printf.printf, but the SDL library messes with that, so the output only appears when you exit. Now that Claudius has a built in font, we should be able to display messages on screen!

We should:

• Provide an internal call for logging a string
• Display those strings on screen for a brief time
• Try to ensure they're somewhat visible :)

[mdales]

Initial work in progress

[mdales]

One of the challenges with doing logging within the visual space of Claudius is that the colours are defined by the user, not Claudius. We could have some magic colour space for Claudius, but for now I've tried to do the following trick:

• Process the palette to work out the two most visually distinct colours (done using colour space trickery)
• Draw stats and log messages using one of those colours for the text and the other for a border around the text

Whilst not always great, should mean things are always somewhat. visible.

[pawaskar-shreya]

Process the palette to work out the two most visually distinct colours (done using colour space trickery)

OKayyy this is new!

[mdales]

Resolved in #121