installer: Support showing status information in terminal title (#16259)

Installing packages with a lot of dependencies does not have an easy way
of judging the current progress (apart from running `spack spec -I pkg`
in another terminal). This change allows Spack to update the terminal's
title with status information, including its current progress as well as
information about the current and total number of packages.

lib/spack/llnl/util/tty/log.py

@@ -33,7 +33,7 @@
 
 
 # Use this to strip escape sequences
-_escape = re.compile(r'\x1b[^m]*m|\x1b\[?1034h')
+_escape = re.compile(r'\x1b[^m]*m|\x1b\[?1034h|\x1b\][0-9]+;[^\x07]*\x07')
 
 # control characters for enabling/disabling echo
 #