Big refactoring (#8)

Big codebase refactoring. 

* Multiple clients are allowed on the same browser instance
* Particle queue processing is split from particle handling logic
* Public AIP is completely rethought
* Updated project file structure. Clean exports for public api methods
* Additional unit tests

src/index.ts

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2020 Fluence Labs Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export { seedToPeerId, peerIdToSeed, generatePeerId } from './internal/peerIdUtils';
+export { FluenceClient } from './FluenceClient';
+export { SecurityTetraplet, PeerIdB58 } from './internal/commonTypes';
+export * from './api';
+export { Particle } from './internal/particle';