plugins fix/logs

[zomfg]

This should fix #396 (works for me™)
while I was there:

• some small improvements to the parsing of the .ini (exec args parsing could be better though, but can be worked around)
• added a documented template for the said .ini
• added plugin output (and some other info) to the logs

[psieg]

Which part is it that broke with .22? I remember any changes to plugins...

[zomfg]

passing "foo -bar -baz" as is to QProcess does not seem to work (any more?)
splitting it into "foo" program and ("-bar", "-baz") args works
maybe Qt quietly cleaned this misuse a while back (setArguments is there since 5.1), not sure

[psieg]

I see. Thanks for the details