1.(DONE) Don't create a feature with duplicating name
    Add checks in create and save feature functions

2.(DONE) Add processing for FEATURES_SUSPEND variable features functions to suspend
this module variables populating.

3.(DONE) Are Features accord toolchain? Implement this check. Maybe to process a cache cmake
variable. FEATURES_TIE_BUILD

4. find_package() support for modules, and write documentation.