WIP: Verify if the hunter id path is the same as before

[Bjoe]

• I've checked this Git style guide. Yes
• I've checked this CMake style guide. Yes
• My change will work with CMake 3.2 (minimum requirement for Hunter). Yes
• I will try to keep this pull request as small as possible and will try not to mix unrelated features. Yes

This is a proposal of the following error in PR #139

[Bjoe]

But maybe it is better to cache Hunter-ID, Config-ID and Toolchain-ID ... if some of them are changed, then we should throw an error....

[NeroBurner]

is it possible to create a test, that would trigger this check?

https://github.com/cpp-pm/hunter/tree/master/tests

[Bjoe]

@NeroBurner Yep would be a good idea. Let me figured out, I'm not sure yet. But again, take some time :-)

[NeroBurner]

any updates on this?

[Bjoe]

@NeroBurner Unfortunately no progress yet. I tried long time ago and I was some stuck. Then I changed the company + my private hard drive crashed and I need to setup my environment again.