Make application directory read-only

[NikolayXHD]

Anything write-able should be separated into platform-specific ApplicationData and UserData directories.

This is a prerequisite to package the application in any standard way.

[NikolayXHD]

user data

• logs/
• charts/
• history/
• save/
• etc/Mtgdb.Gui.xml

application data

• data/AllPrices.json
• data/AllPrintings.json
• data/index/
• update/

[TeamLinux01]

These would be my suggested places for data. Maybe the saving decks could default to the Documents folders of the User for each OS.

Under Linux: https://askubuntu.com/questions/14535/whats-the-local-folder-for-in-my-home-directory
User data

• /home/username/.local/share/Mtgdb.Gui
  • logs/
  • charts/
  • history/
  • save/
  • etc/Mtgdb.Gui.xml

Application data

• /home/username/.cache/Mtgdb.Gui
  • data/AllPrices.json
  • data/AllPrintings.json
  • data/index/
  • update/

Under Windows: https://www.howtogeek.com/318177/what-is-the-appdata-folder-in-windows/
User data

• C:\Users\username\AppData\Roaming\Mtgdb.Gui
  • logs\
  • charts\
  • history\
  • save\
  • etc\Mtgdb.Gui.xml

Application data

• C:\Users\username\AppData\LocalLow\Mtgdb.Gui
  • data\AllPrices.json
  • data\AllPrintings.json
  • data\index\
  • update\