Instead of reading the terminal size on every status update, register
for SIGWINCH to read and store the size when it changes.
Test: status_test.go
Change-Id: I555ad21a31a2c924ab0ca681e0c8f00df42a370a
Bolding the status line provides differentiation between output
of each command.
Test: status_test.go
Change-Id: I9d46761e69c5af0a0aa86c7921e121cfd2a3fc82
Write log output through StatusOutput so that the status implementation
can synchronize it with its own output.
Test: status_test.go
Change-Id: I917bdeeea4759a12b6b4aa6d6d86ee18a2771723
terminal.Writer is now just a wrapper around stdio.Stdout() without
any useful functionality. Replace it with stdio.Stdout() as an
io.Writer.
Test: ui/terminal/status_test.go
Change-Id: I5bc5476afdca950b505642f0135a3af9d37fbe24
Support for smart and dumb terminals are implemented in writer.go,
which makes dumb terminals much more complicated than necessary.
Move smart and dumb terminals into two separate implementations
of StatusOutput, with common code moved into a shared formatter
class.
Test: not yet
Change-Id: I59bbdae479f138b46cd0f03092720a3303e8f0fe
