Made Arduino IDE scroll during upload

[earlephilhower]

Description of change

When esptool is run from the Arduino IDE, the output window doesn't
scroll because of the \rs used to make the console update status on a
single line.

To avoid this, don't attempt to output everything on a single line when
scripted (i.e. not running on a TTY) by replacing \r with \n.

See esp8266/Arduino#6765 for some discussion.

I have tested this change with the following hardware & software combinations:

ESP8266 Arduino IDE under Linux with WeMos D1 Mini (clone?)

I have run the esptool.py automated integration tests with this change and the above hardware. The results were:

** The two failures at 921k baud are expected and a known problem with my board, a WeMos D1 Mini, so can be ignored. **

earle@server:~/src/esptool/test$ ./test_esptool.py /dev/ttyUSB0 esp8266 230400
Running esptool.py tests...
.......sss..........s..E
Stdout:

---

Running /usr/bin/python /home/earle/src/esptool/test/../esptool.py --chip esp8266 --port /dev/ttyUSB0 --baud 921600 write_flash 0x0 images/fifty_kb.bin...
esptool.py v2.9-dev
Serial port /dev/ttyUSB0
Connecting....
Chip is ESP8266EX
Features: WiFi
Crystal is 26MHz
MAC: 60:01:94:23:b4:a6
Uploading stub...
Running stub...
Stub running...
Changing baud rate to 921600
Changed.
Configuring flash size...

A fatal error occurred: Invalid head of packet (0xE0)

........................

ERROR: test_highspeed_flash (main.TestFlashing)

Traceback (most recent call last):
File "./test_esptool.py", line 226, in test_highspeed_flash
self.run_esptool("write_flash 0x0 images/fifty_kb.bin", baud=921600)
File "./test_esptool.py", line 85, in run_esptool
raise e
CalledProcessError: Command '['/usr/bin/python', '/home/earle/src/esptool/test/../esptool.py', '--chip', 'esp8266', '--port', '/dev/ttyUSB0', '--baud', '921600', 'write_flash', '0x0', 'images/fifty_kb.bin']' returned non-zero exit status 2

Stdout:

---

Running /usr/bin/python /home/earle/src/esptool/test/../esptool.py --chip esp8266 --port /dev/ttyUSB0 --baud 921600 write_flash 0x0 images/fifty_kb.bin...
esptool.py v2.9-dev
Serial port /dev/ttyUSB0
Connecting....
Chip is ESP8266EX
Features: WiFi
Crystal is 26MHz
MAC: 60:01:94:23:b4:a6
Uploading stub...
Running stub...
Stub running...
Changing baud rate to 921600
Changed.
Configuring flash size...

A fatal error occurred: Invalid head of packet (0xE0)

---

Ran 48 tests in 439.226s

FAILED (errors=1, skipped=4)

[projectgus]

Hi @earlephilhower

Sorry I didn't first reply when you submitted this PR.

I've re-implemented these changes at a slightly higher level (adding a print_overwrite function), plan to merge it for the v2.9 release. This PR will be updated once it merges

Thanks,

Angus

[projectgus]

Implemented as 028b672 . Should be equivalent logic, let me know if there is any remaining problem with the output in the Arduino IDE @earlephilhower :)