VU Server Filesystem class

[SasaKaranovic]

Summary

This PR consolidates all file paths referenced by VU Server into single class.
It also adds feature that allows for changing VU Server data directory by specifying VU_SERVER_DATA_PATH system environment variable.

Server will test directories in the following order

1. Directory specified by the system environment variable (VU_SERVER_DATA_PATH)
2. User directory (ie. c:\Users\USERNAME\ or /users/USERNAME/)
3. VU Server install directory (ie. c:\Program Files\KaranovicResearch\VUServer\)

In order to use the directory, VU Server needs to have read/write access to it.
This is tested by writing a file to the directory and then removing it.
If this operation is successful, server will stop and use that folder as VU Server data folder.

Added

• VU Filesystem class
  • Determines file paths for all VU Server data
  • Checks if data directory is writeable
  • Creates default folder structure
  • Creates default files used by the server (if missing, ie config.yaml, imgblank )
  • (temp-fix) Migrates data from VU SErver installation folder to new VU Server data folder

Changed

• Base logger will use VU Filesystem class to determine the log file path
• Server will use VU Filesystem class to determine file upload path, PID file path
• Server Config will use VU Filesystem class to determine the location of config.yaml file
• Database will use VU Filesystem class to determine the location of vudials.db file
• VU Notification class will print messages to console on non-Windows systems (instead of ignoring them)

Removed

• NA

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