Linkify title

play(): Always return the number of lives left

Order variables by first usage

Replace buffer_len with sizeof(buffer) / sizeof(*buffer)

Rename LICENSE.rogueutil to apache.txt

Simplify showMessage(), use standard vsnprintf(3)

Remove typedefs

Use heap allocation instead of arrays

Remove unnecessary comments

Declare nextX and nextY on the same line

Replace //-style comments with /* */-style

Improve Makefile

Flush output in showMessage

This caused welcome and game over messages to not appear until pressing
a key for some reason.

Fix switch fallthrough

Remove rogueutil comment

This comment was added to provide context to the grader of my AP
Portfolio project, but it is no longer necessary.

Change 'with' to 'about'

Use the past tense

Expand upon README.md

This includes a better introduction, build instructions, copyright info,
and a pointer to the sr.ht project.

Add LICENSE.rogueutil

This is a copy of the Apache License, v2.0. It is the license under
which rogueutil is made available. To not distribute it with this
program is an infringement of its terms.

Make the title in README.md lowercase