buffyboard: track virtual terminals with /sys/class/tty/tty0/active

Vladimir Stoiakinrequested to merge
vstoiakin/buffybox:signal into master

The patch:

  1. Replaces periodic requests for a current virtual terminal with epoll() on /sys/class/tty/tty0/active;
  2. Adds a signal handler for SIGUSR1 that triggers updating of the screen manually;
  3. Adds support for arbitrary font sizes.

Fixes #32 (closed).
Fixes #11 (closed).
Fixes #3 (closed).

Edited by Vladimir Stoiakin

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