mavsdk_tests: split up Python script

Otherwise, the script will get a tangled mess.

test/mavsdk_tests/logger_helper.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python3
+
+import re
+import sys
+import os
+
+
+def supports_color():
+    """Returns True if the running system's terminal supports color.
+
+    From https://stackoverflow.com/a/22254892/8548472
+    """
+    plat = sys.platform
+    supported_platform = plat != 'Pocket PC' and (plat != 'win32' or
+                                                  'ANSICON' in os.environ)
+    # isatty is not always implemented, #6223.
+    is_a_tty = hasattr(sys.stdout, 'isatty') and sys.stdout.isatty()
+    return supported_platform and is_a_tty
+
+
+if supports_color():
+    class color:
+        PURPLE = '\033[95m'
+        CYAN = '\033[96m'
+        DARKCYAN = '\033[36m'
+        BLUE = '\033[94m'
+        GREEN = '\033[92m'
+        YELLOW = '\033[93m'
+        RED = '\033[91m'
+        BOLD = '\033[1m'
+        UNDERLINE = '\033[4m'
+        END = '\033[0m'
+else:
+    class color:
+        PURPLE = ''
+        CYAN = ''
+        DARKCYAN = ''
+        BLUE = ''
+        GREEN = ''
+        YELLOW = ''
+        RED = ''
+        BOLD = ''
+        UNDERLINE = ''
+        END = ''
+
+
+def remove_color(text):
+    """Remove ANSI and xterm256 color codes.
+
+    From https://stackoverflow.com/a/30500866/8548472
+    """
+    return re.sub(r'\x1b(\[.*?[@-~]|\].*?(\x07|\x1b\\))', '', text)