update to substrate 3.0 (#307)

* bump all deps

* upgrade emergency shutdown pallet to substrate 3.0

* upgrade allocations pallet to substrate 3

* upgrade amendments pallet to substrate 3

* upgrade grants pallet to substrate 3

* fix rebased cargo.toml deps

* upgrade pallet-poa to substrate 3.0

* upgrade pallet-reserve to substrate 3.0

* upgrade pallet-tcr to substrate 3.0

* upgrade pallet-root-of-trust to substrate 3.0

* upgrade pallet-root-of-trust-rpc-runtime-api to substrate 3.0

* re add contracts pallets to node's cargo toml

* no longer need to pin rust compiler version

* fix toolchain init script

* runtime to substrate 3.0

* bump node to substrate 3.0

* fix duplicated balance issue with local nets

* remove mac os garbage files

* fmt it all

.gitignore

@@ -4,3 +4,6 @@
 
 # These are backup files generated by rustfmt
 **/*.rs.bk
+
+# Mac OS annoyances
+.DS_Store