Save functions, variables and history independently.

[Mikko Syrjä]

Someone raised this issue for my mobile version: https://github.com/mikkosyrja/speedcrunch-sailfish/issues/13

I agree with user. Current behavior is not intuitive and not even well documented. Could we have separate setting file for functions and variables?

This is also mentioned in one previous issue: https://bitbucket.org/heldercorreia/speedcrunch/issues/743/annoying-stuff

If you agree, I’m willing to implement it.

[Helder Correia]

Yes, this is totally wrong. @syrja Please go ahead, tagging it for 1.0.