Load default settings from DV80 config file

[MirrorPusher]

Load default settings from DV80 config file DSK1.STEVIE;CFG upon editor startup.

A DV80 config file is to be introduced with default settings for Stevie.
It will be a simple file, with key=value pairs and lines can start with '#' for remarks

Example:

# Stevie configuration file
CLIPBOARD=DSK6.CLIP1
STORAGE=DSK,HDX,IDE,PI.,PIO,TIPI.,RD,SCS,SDD,WDS,RS232
PRINTER=PI.PIO
COLORSCHEME=10

Pressing the SPACE bar while the editor starts will skip loading the config file from DSK1.
Unknown key names will be ignored.