New user-writeable directory structure

[ForNeVeR]

Currently, we have several folders in Paths that should be user-writable:

• DownloadedResourceDir
• ConfigDirPath
• LogDirPath
• ScreenshotsDirPath

Let's move them accordingly.

• [ ] DownloadedResourceDir: to the persistent app data folder since that's the user content
  • Maybe something like Documents\My Games on Windows?
  • $XDG_DATA_HOME/bloodmasters aka ~/.local/share/bloodmasters on Linux
  • ~/Library/Bloodmasters on macOS
• [ ] ConfigDirPath
  • %APPDATA%\Bloodmasters on Windows
  • $XDG_CONFIG_HOME/bloodmasters aka ~/.config/bloodmasters on Linux
  • ~/Library/Preferences/bloodmasters on macOS
• [ ] LogDirPath
  • %TEMP%\Bloodmasters\Logs\ on Windows
  • $XDG_STATE_HOME/bloodmasters aka ~/.local/state on Linux
  • ~/Library/Logs/Bloodmasters on macOS
• [ ] Make sure there's a reasonable log cleanup policy / size limit
• [ ] On the server, just log to stdout by default and make the logging system configurable
• [ ] ScreenshotsDirPath
  • %USERPROFILE%\Pictures\Screenshots on Windows
  • $XDG_PICTURES_DIR/Bloodmasters aka ~/Pictures/Bloodmasters
  • Desktop folder on macOS
• [ ] Make sure the server dirs are configurable
• [ ] Document all that