Release v0.25.0

- AnsiTerm: Added a "resize" method (experimental), and a method to

register/cancel a callback when the terminal receives one of the ANSI
sequences that change te cursor key mappings (see "multi.html" for an
example of use).
- Fixed an error (typo) in some of the methods that cancel callbacks.
- Added sound (ASCII "BEL", code 0x07) ad a method to turn it on, off,
and configure some characteristics.