Add a custom logging function - allows logging to file

[RayyanAnsari]

trafficstars

This PR creates a custom logging function and gives an option to either log to console, or to log to file.

Changes

• All printf calls are now Platform::LogMessage
• A new settings dialog has been created: Log Settings
• Two new variables are added to the config file: LogToFile and LogFileLocation
• The new Platform::LogMessage function uses either vprintf or vfprintf depending on the user's setting

[nadiaholmquist]

If we're doing a custom logging thing, we really should also have log levels I think?

[RayyanAnsari]

We could, but currently this is just a wrapper around printf and fprintf. That would require modifying all of the printf statements we have.