Code coverage fixes (#640)

* Update coveralls link to point to protocol repo coverage

* Remove obsoleted ignores in .gitignore

* Run forge coverage in CI and upload results to coveralls

* Remove unused wrapper

* Remove legacy coverage setup

* Remove lcov-result-merger

* Add base-path setting to coverallsapp in CI

contracts/test-utils/src/index.ts

@@ -20,7 +20,6 @@ export { signingUtils } from './signing_utils';
 export { orderUtils } from './order_utils';
 export { typeEncodingUtils } from './type_encoding_utils';
 export { profiler } from './profiler';
-export { coverage } from './coverage';
 export { Web3ProviderEngine } from '@0x/subproviders';
 export { randomAddress } from './address_utils';
 export { OrderFactory } from './order_factory';