Full code review: dependencies, structure, asynchronous calls

Branch: http://github.com/frgomes/iroha-scala/tree/RG0001-Code_review

This ticket has three aims overall:

make iroha-scala work with upcoming version 1.0 of Iroha;
make the library fully asynchonous;
adhere to best practices, in particular in regards to exception handling.

As a secondary aim, we should be able to employ ScalaJS and generate Javascript for the library, possibly making it available in Android platforms. For this reason, we are going to review dependencies and availability of libraries for Android.

Other reasons for a full code review involves best practices such as:

Avoid throwing exceptions
Eradicate blocking calls, which are not supported in Javascript (i.e.: ScalaJS)
Embrace best practices in FP in general.

Review dependencies:

[ ] Replace BouncyCastle by SpongyCastle instead.
[x] Replace ScalaTest by uTest instead.
[x] Remove the following dependencies: "org.scala-lang.modules" %% "scala-xml" % "1.1.0", "org.scala-lang.modules" %% "scala-parser-combinators" % "1.1.1"
[x] Introduce Monix

Review SBT project structure and plugins

[x] Review SBT version
[x] Review plugin dependencies
[ ] Review organization employed in build.sbt
[ ] Review publishing process
[ ] Review release process
[ ] Rewrite README.md
[ ] Introduce CHANGES.md
[ ] Employ com.lihaoyi:acyclic plugin
[x] Prepare for Dotty, even though it may not compile or build

Review asynchronous calls:

[ ] Employ Monix for asynchronous calls
[x] Remove blocking calls

Review exception handling:

[x] Employ Try/Success/Failure
[ ] Remove unhandled exceptions: exceptions can only be thrown inside Try blocks
[ ] Employ WartRemover so that bad practices can be caught

Review coding standards:

[ ] Employ uTest instead of ScalaTest
[x] Rename SHA3EdDSAPrivateKeySpec to simply PrivateKey
[x] Rename SHA3EdDSAPublicKeySpec to simply PublicKey
[ ] Review all ScalaDocs

frgomes / iroha-scala

Full code review: dependencies, structure, asynchronous calls #1