Merge pull request Quantinuum#1079 from CQCL/release/1.21.0

Release/1.21.0

fix bug and improve typing of logic expressions (Quantinuum#1078)

* fix bug and improve typing of logic expressions

Only allow creation of logic_exps through the various class constructors
for each expression (RegOr, RegMul, etc.). Only create new LogicExps
using create_reg/bit_logic_exp, which use the class constructors.
Also type the c++ functions better that use, return LogicExps

* linting

* cleanup

add more wasm examples and clean up checks (Quantinuum#1070)

* add more wasm examples and clean up checks

* mypy

* replace un/invalid

* remove readme.txt

* update gitignore

* clean up error handling in wasm parsing

* add details to the readme file in the c++ generation

add aditional check for index out of array functions (Quantinuum#1058)

* add aditional check for index out of array functions

* black

Merge pull request Quantinuum#1037 from CQCL/release/1.20.1

Release/1.20.1

remove unnecessary and faulty cast to Gate in op.get_unitary (Quantin…

…uum#1030)

* remove unnecessary and faulty cast to Gate in op.get_unitary

* add test, and changlog entry

* clang + black

Merge pull request Quantinuum#1024 from CQCL/release/1.20.0

Release/1.20.0

[bugfix] Fix handling of range predicates and scratch bits in QASM co…

…nversion (Quantinuum#1022)

fix wasm, update changelog (Quantinuum#1021)

* fix wasm, update changelog

* black format

* add additional testcase

* fix black

`BarrierOp` and `Circuit._add_conditional_barrier` (Quantinuum#988)

* Add new `BarrierOp`

Remove `OpType::Barrier` from `MetaOp`

* Add Circuit::add_conditional_gate

unsigned and UnitID constructors

* Add tests to confirm DAG is wired suitably for conditional barrier gates

* Add tests and case handling for conditional barrier over different circumstances

* add `_add_conditonal_barrier` method to Circuit class

* bump

* black format

* Update test_Circ.cpp

* Update add_op.cpp

* bump

* Update add_op.cpp

* Expose BarrierOp to python

* Make `barr` signature accurately reflect internal UnitID, add test

* reformat tests

* Update main.cpp

* Update qasm.py

* Update circuit.pyi

* Update test_Circ.cpp

* requested changes from review

* fix types

* Update basic_circ_manip.cpp

* Update basic_circ_manip.cpp

* Update qasm_test.py

* Update qasm_test.py

* Update circuit.pyi

* Add symbolic substituion test for barrier op

* Update  serialization/deserialization for MetaOp/BarrierOp

* add MetaOp::is_equal

* Add back data type

* Update add_op.cpp

* bump

* bump

* bump

* update with requested changes