Version 3.1.1

Build croaring without optimizations

version bump for 3.1.0 release (mimblewimble#3258)

bump to 3.1.0-beta.3 (mimblewimble#3252)

bump version to 3.1.0-beta.2 (mimblewimble#3244)

Block input bitmap rework (mimblewimble#3236)

* first pass at rewind_single_block
and reworking rewind to simply iterate over blocks, rewinding each incrementally

* commit

* commit

* cleanup

* add test coverage for output_pos index transactional semantics during rewind

* commit

* do not store commitments in spent_index
just use the order of the inputs in the block

* compare key with commitment when cleaning output_pos index

* remove unused OutputPos struct

version bump for 3.0.0 release (mimblewimble#3179)

version bump (mimblewimble#3174)

Versioning for 3.0.0-beta.2 (mimblewimble#3170)

* versioning for beta build

* Cargo.lock

Version bump for beta.1 (mimblewimble#3159)