- convert to singlespec

- update to 0.7.5:
  * `case_insensitive` is no longer a runtime-settable parameter, but it was still listed as such
  * Fixed a recursive loop bug when abbreviated commands are enabled and it could get stuck in the editor forever
  * Fixed argparse_example.py and pirate.py examples and transcript_regex.txt transcript
  * Fixed a bug in a unit test which occurred under unusual circumstances
  * Organized all attributes used to configure the ParserManager into a single location
  * Set the default value of `abbrev` to `False` (which controls whether or not abbreviated commands are allowed)
  * Improved implementation of `load` to use command queue instead of nested inner loop
  * Fixed a couple bugs in interacting with pastebuffer/clipboard on macOS and Linux
  * Fixed a couple bugs in edit and save commands if called when history is empty
  * Ability to pipe ``cmd2`` command output to a shell command is now more reliable, particularly on Windows
  * Fixed a bug in ``pyscript`` command on Windows related to ``\`` being interpreted as an escape
  * Ensure that path and shell command tab-completion results are alphabetically sorted
  * Removed feature for load command to load scripts from URLS
  * Removed presence of a default file name and default file extension
  * ``load`` command has better error checking and reporting
  * Clipboard copy and paste functionality is now handled by the **pyperclip** module
  * ``shell`` command now supports redirection and piping of output
  * Added a lot of unit tests
  * Removed pause command
  * Added a dependency on the **pyperclip** module
  * Fixed a bug in displaying a span of history items when only an end index is supplied
  * Fixed a bug which caused transcript test failures to display twice
  * Added the ability to exclude commands from the help menu (**eof** included by default)
  * Redundant **list** command removed and features merged into **history** command
  * Added **pyscript** command which supports tab-completion and running Python scripts with arguments
  * Improved tab-completion of file system paths, command names, and shell commands
  * Changed default value of USE_ARG_LIST to True - this affects the beavhior of all **@options** commands

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