* patterns/uf2: add family ID enum
* patterns/uf2: Fix enum spacing
* patterns: add missing description pragmas and README entries, etc.
* patterns/uf2: add reference for Family ID enum
* Add `current_bit_offset()` and `read_bits(...)` to `std::mem`
* Replace deprecated BitfieldOrder enum values with new clearer names
This adds new options named `MostToLeastSignificant` and `LeastToMostSignificant` to replace the old `LeftToRight` and `RightToLeft` names. These names should be much clearer about what they affect and how.
* Throw errors when `std::core::(get|set)_bitfield_order()` are called
* Update all patterns to work with the new bitfield behaviors
