…d7eb6d7; removed bls code warnings

- Fixed qc_chain end() iterator dereferencing and raising exceptions when some internal inconsistence in the hotstuff core is detected
- Fixed test_hotstuff failing under random conditions (e.g. use of std::vector::reserve())
- Added two alternative implementations to the qc_chain proposal store to help debug potential invalid memory access problems (choose which one to use with a #define); they show similar performance in initial benchmarks, and both seem to be working without issues; we will choose one prior to release
- Added missing variable/member initializations
- chain_pacemaker now owns and manages its qc_chain object
- Removed init() idiom and replaced with full initialization on object construction
- Refactored and simplified Pacemaker interfaces (base_pacemaker is the minimal interface that qc_chain needs, only)
- Removed exception filters in the hotstuff core (now exceptions will cause tests, and nodeos, to fail)
- Lots of miscellaneous simplifications and other improvements to the code

…ging

…-finalizer-set-transition-2

… key and signature

…tests

IF: Generate bls key pair

add set_finalizers to host functions list

use raw Affine little-endian form of g1/g2 for encoding to BLS public key and signature

…-finalizer-set-transition-2

IF: Check if input strings are invalid in conversion to public key or signature

…tion-2

IF: set_finalizers updates

…tion-3

IF: Add support to producer_plugin to load BLS finalizer keys

…ernal wiring for signing and signature verification