Revert "Use unique_ptr instead of shared_ptr in our any implementation, >10% speed improvement"
Revert "Use unique_ptr instead of shared_ptr in our any implementation, >10% speed improvement"

This reverts commit f27739cf7183a0f9cbdffaa7e29c7b47b25b0508.

bradparks/ChaiScript__cplusplus_scripting_language,bradparks/ChaiScript__cplusplus_scripting_language,kamilzubair/ChaiScript,bradparks/ChaiScript__cplusplus_scripting_language,kamilzubair/ChaiScript,kamilzubair/ChaiScript