Break out non-autocomplete changes from autocomplete PR (#618)

This improves the ephemeral command runner to allow for honoring of
timeouts and proper handling of overriding the current working
directory. It also fixes some partially transparent font colors in light
mode, making them solid instead. It also updates the InputModel to be
auto-observable and utilize some getters to ensure the cmdinput is
getting updated whenever necessary state changes take place.

wavesrv/pkg/bufferedpipe/bufferedpipe.go

@@ -15,6 +15,7 @@ import (
 	"time"
 
 	"github.com/google/uuid"
+	"github.com/wavetermdev/waveterm/waveshell/pkg/wlog"
 	"github.com/wavetermdev/waveterm/wavesrv/pkg/scbase"
 	"github.com/wavetermdev/waveterm/wavesrv/pkg/waveenc"
 )
@@ -110,6 +111,7 @@ func (pipe *BufferedPipe) WriteTo(w io.Writer) (n int64, err error) {
 
 // Close the pipe. This will cause any blocking WriteTo calls to return.
 func (pipe *BufferedPipe) Close() error {
+	wlog.Logf("closing buffered pipe %s", pipe.Key)
 	defer pipe.bufferDataCond.Broadcast()
 	pipe.closed.Store(true)
 	return nil