Mesh-498: Identity based committee (#155)

* new committee module

* propose method

* added VoteThreshold type that can be added to Trait type

* replace old governance committee with identity based committee

* committee instance, add instance to chain spec

* Keep AccountId in RawOrigin as phantom data to match calls expecting T::Origin

* Replace collective with the new committee

* Removed old committee completely

* Added ProportionMatch to be used with threshold to be used in comparision

* voting threshold for determining acceptance or rejection criteria

* Implemented vote threshold conditions

* adding tests

* basic tests setup

* Merge branch 'master' into MESH-498/identity-based-committee

# Conflicts:
#	runtime/src/lib.rs
#	runtime/src/runtime.rs
#	src/chain_spec.rs

* Attempt to set a test origin

* test using construct_runtime

* Change proportion to at least 2/3 amd added voting info to events

* Change proportion to at least 2/3

* Fixed committee tests

* tests for membership and voting

* tests for error conditions - preventing non members from proposing and voting

* tests for revoting
tests for throwing error when index doesn't match proposal hash

* - added method for committee to change vote threshold
- improved documentation

* Merge branch 'master' into MESH-498/identity-based-committee

# Conflicts:
#	runtime/src/runtime.rs

* Added CommitteeMembership to manage membership of committee through governance

* Added ChangeMembers, InitializeMembers trait impls and tests

Co-authored-by: Mudit Gupta <guptamudit@ymail.com>

runtime/Cargo.toml

@@ -58,6 +58,7 @@ phragmen = { package = "substrate-phragmen", git = "https://github.com/paritytec
 
 [dev-dependencies]
 test-client = { package = "substrate-test-runtime-client", git = "https://github.com/paritytech/substrate", rev = "7d7e74fb77b6bee2ce9d6ebafcae09caff2d0e50" }
+hex-literal = "0.2.1"
 
 [build-dependencies]
 wasm-builder-runner = { package = "substrate-wasm-builder-runner", version = "1.0.2" }