Follow FluidUi.Icon API changes

Property was renamed to iconName.
Panel indicator text color darker

Make text color darker so it seems even brighter when hovered.
Replace VSettings with plain QSettings

VSettings is not yet ready.
Remove VSettings references

We were not using VSettings from C++ anyway since recent commits.
Change project name on all notices

Some code comes from other repositories like Green Island or Vibe, but
we want the same name for all files.