Add `symoroutils/configfile.py`
Rename `make_file_path()` to `get_file_path()`

Rename `make_file_path()` to `get_file_path()` in
`symoroutils/filemgr.py`.
Update all calls.
Modify to store PAR file path in `Robot` class
Modify file path variable in `writepar()`

Modify file path variable in `writepar()` to read from the `Robot`
instance.
Modify to store last used robot

Modify `symoroui/layout.py` to store the last used robot in the settings
file.
Modify default robot to RX90
Modify to load the last used robot at program start
Modify default folder on `Open` command
Minor modification
Merge branch 'config-file'