[Breaking] Disable ECHO except for newlines

Also explicitely set other flags, like ICANON, ISIG, IEXTEN, and
input NL-CR conversion flags.

lib/command.js

@@ -24,8 +24,12 @@ function Command(reply, context, command) {
     rows: context.size.rows,
     cwd: context.cwd,
     env: context.env,
-  }); //FIXME: disable ISIG, ICANON, IEXTEN
+  });
   this.termios = new termios.Termios(this.pty._fd);
+  this.termios.c_lflag &= ~(tsyms.ISIG | tsyms.IEXTEN);
+  this.termios.c_lflag &= ~tsyms.ECHO; // disable ECHO
+  this.termios.c_lflag |= tsyms.ICANON | tsyms.ECHONL; // we need it for /end, it needs to be active beforehand
+  this.termios.c_iflag = (this.termios.c_iflag & ~(tsyms.INLCR | tsyms.IGNCR)) | tsyms.ICRNL; // CR to NL
   this.termios.writeTo(this.pty._fd);
 
   this.terminal = terminal.createTerminal({
@@ -49,7 +53,7 @@ function Command(reply, context, command) {
     startFill: "·  ",
   });
   this._initKeypad();
-  //FIXME: take additional steps to reduce messages sent to group
+  //FIXME: take additional steps to reduce messages sent to group. do typing actions count?
 
   // Post initial message
   this.initialMessage = new utils.EditedMessage(reply, this._renderInitial(), "HTML");