v0.1.9-alpha

Version 0.1.9-alpha

- Uses historical temperature data for six cities along
the trail to generate temperatures while traveling.
- Saves approximately 2 kilobytes of PRG-ROM by updating
the DisplayNumberHundreds and DisplayNumberThousands macros
to use subroutines for bulk of code.
- Highlights current name on alphabet screen. However, this
may not be enough of an indicator. I may need to use a sprite
for an indicator, and cycle through which sprites are
active (causing flickering).
- Tweaks title screen colors so wagon cloth is white rather
than pinkish.
- Adds "very poor" health status icon and "snow" and "snowstorm"
weather status icons. Tweaks other status icons.