Check macOS 10.14 Mojave compatibility

[aonez]

Maxwell reported via mail some problems with Keka's bundled p7zip in 10.14 Mojave first beta.

• Get Mojave up and running (complicated with my newest Mac being a Macbook Air Mid 2011):
  • Virtualbox guest does not work, since it does not boot an APFS and Mojave does not have the converttoapfs flag.
  • Using Parallels. Not very smooth but working, sure they'll update for Mojave sooner than later. Not using Parallels Tools since it's not yet optimised.
• Test for issues -> No blocking issue found.
• Dark mode not applied in Keka. Maybe read this. Maybe Xcode 10 is needed for this one. Some more info from MacKuba.
• Some icons do not show in the format selector (GZ, BZ2 and LZ), they show in the toolbar buttons:
  
• Package text is white on Dark Mode, tweak the background image.

All my compression/extraction tests succeeded without any error. If anyone finds some error while running in Mojave, please comment them here.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.