Input api issues

[MichaelMackus]

I had a few issues using bracket-lib dealing with the Input API. Mostly because I assumed ctx.key represents all/most of the ascii character set at least, but it seems a bit lacking. For example when I input things like ">" and "<" (common up-stair/down-stair keys) the ctx.key never gets populated by anything. I think adding something that corresponds to the ascii character would help here - for example ctx.ch which returns a char. This would also be helpful for text input.

Just an idea. I eventually implemented input using INPUT.lock() which seemed to work much better, but took a bit more boilerplate.