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Fix compatibility with cmd2 >= 2.3.0

cmd2.fg and cmd2.bg have been deprecated in cmd2 2.3.0 and removed
in cmd2 2.4.0.  Let's work around this by a version check.

Related upstream commits:

commit f57b08672af97f9d973148b6c30d74fe4e712d14
Author: Kevin Van Brunt <kmvanbrunt@gmail.com>
Date:   Mon Oct 11 15:20:46 2021 -0400

and

commit f217861feae45a0a1abb56436e68c5dd859d64c0
Author: Kevin Van Brunt <kmvanbrunt@gmail.com>
Date:   Wed Feb 16 13:34:13 2022 -0500

Change-Id: I9fd32c0fd8f6d40e00a318602af97c288605e8e5
---
M pySim-shell.py
M pySim/ts_102_222.py
2 files changed, 7 insertions(+), 2 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/pysim refs/changes/75/30075/1

diff --git a/pySim-shell.py b/pySim-shell.py
index e52c4ef..938223a 100755
--- a/pySim-shell.py
+++ b/pySim-shell.py
@@ -23,7 +23,13 @@
 import traceback
 
 import cmd2
-from cmd2 import style, fg, bg
+from cmd2 import style
+# cmd2 >= 2.3.0 has deprecated the bg/fg in favor of Bg/Fg :(
+from packaging import version
+if version.parse(cmd2.__version__) < version.parse("2.3.0"):
+    from cmd2 import fg, bg
+else:
+    from cmd2 import Fg as fg, Bg as bg
 from cmd2 import CommandSet, with_default_category, with_argparser
 import argparse
 
diff --git a/pySim/ts_102_222.py b/pySim/ts_102_222.py
index c7cff85..3c57e5b 100644
--- a/pySim/ts_102_222.py
+++ b/pySim/ts_102_222.py
@@ -20,7 +20,6 @@
 from typing import List
 
 import cmd2
-from cmd2 import style, fg, bg
 from cmd2 import CommandSet, with_default_category, with_argparser
 import argparse
 

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