Ability to exclude files from intellisense

[Timmmm]

Feature Request

I have a project that works fine with intellisense except for one enormous file which is 200k lines long (it's generated). If I open that file than the cpptools process hits 100% CPU and never goes back.

It would be really helpful to have a feature like C_Cpp.codeAnalysis.exclude or C_Cpp.files.exclude but that works for intellisense, like C_Cpp.intellisense.exclude.