[BUG] Config not migrated from 0.10 to 1.0(pre)

[llimeht]

Description
I have an existing configuration from projecteur 0.10 that is not migrated to

To Reproduce

• install version 0.10 of projecteur (in my case from the Debian packages)
• configure it; config gets written to ~/.config/Projecteur/Projecteur.conf
• install newer version of projecteur (built current git develop, ddb942d)
• launch it, find that previous configuration has not been migrated; new config is in ~/.config/projecteurrc

Expected behavior
Configuration to preserved as much as possible; configuration isn't massively complex so this is not heart-wrenching data loss, but it would be nice to port over the configuration of colours, sizes, spotlight vs laser effects, keystrokes etc

Desktop/Linux Environment (please complete the following information):

• Linux Distribution and Version: Debian forky
• Desktop/Window Manager and Version plasma 6.7.4 . qt 6.10
• Did you built Projecteur yourself?: y
• What is the output of projecteur -f ?:

$ projecteur -f
kf.coreaddons.kaboutdata: Could not initialize the equivalent properties of Q*Application: no instance (yet) existing.
Projecteur 1.0.0-alpha.78
  - git-branch: develop
  - git-hash: ddb942d87355fd5a4f90212b22b66da61deb6d3e
  - compiler: GNU 15.3.0
  - build-type: Release
  - qt-version: (build: 6.10.2, runtime: 6.10.2)
  - device-scan: (errors: 0, devices: 1 [readable: 1, writable: 1])

• What is the output of projecteur -d ?: ...

$ projecteur -d
kf.coreaddons.kaboutdata: Could not initialize the equivalent properties of Q*Application: no instance (yet) existing.
Projecteur 1.0.0-alpha.78; device scan

 * Found one supported device. (1 readable, 1 writable)

 +++ name:     'Logitech USB Receiver'
     userName: 'Logitech Spotlight (USB)'
     vendorId:  046d
     productId: c53e
     phys:      usb-0000:02:00.0-3
     busType:   BusType::Usb
     devices:   /dev/input/event8, /dev/input/event11, /dev/input/event9, /dev/input/event10, /dev/hidraw3
     readable:  true
     writable:  true