Made member functions const where possible in OTAxxx.hpp thru OTCxxx.hpp
Merge pull request #162 from BugFreeSoftware/core_const

Made member functions const where possible in OTAxxx.hpp thru OTCxxx.hpp
clang-format-wrapper.sh: drop GNU sed dependency
Merge pull request #182 from toxeus/dropGSed

clang-format-wrapper.sh: drop GNU sed dependency
Rename OTBasket to Basket.
Removed ot_super.
Removed commented out stuff.
Renamed OTBasketItem to BasketItem.
Renamed OTBasket to Basket throughout files.