Changes

fix downstream error: ImportError: cannot import name 'style' from 'cmd2'

cmd2 version 3.0 was released, with significant API changes. Limit the
dependency to below 3.0, as already reflected in requirements.txt.

Seeing but not changing the discrepancy in minimum version:
requirements.txt has >2.6.2 while setup.py has >= 1.5.0.

Related: SYS#7775 SYS#7777
Change-Id: I5186f242dbc1b770e3ab8cdca7f27d2a1029fff6

pySim.runtime: Fix file selection by upper case hex FID

When trying to remove a file (e.g. DF.5G_ProSe, 5FF0),
there seems to be a case sensitive check when checking for the dict:
pySim/runtime.py: get_file_for_filename():

478          def get_file_for_filename(self, name: str):
479              """Get the related CardFile object for a specified filename."""
480              sels = self.selected_file.get_selectables()
481              return sels[name]

The dict sels contains 5ff0, but not 5FF0.
The type of argument name is str. So a case sensitive check will be used.

Change-Id: Idd0db1f4bbd3ee9eec20f5fd0f4371c2882950cd
Closes: OS#6898