Create "HostConfig" class

[MoonBow-1]

Description

Currently GenerateFiles read HostConfigFile and parse, which shouldn't be their responsibility, so a new class is required.

Lines like these are going away as well:

if (!configuration.hostConfigFile.path.toFile().exists()) {
    throw new NullPointerException("HostConfigFile is null");
}

• [x] HostConfig should be responsible for validating itself.
• [x] GenerateFiles should ask HostConfig to validate itself before asking for correct flows and protocols

[MoonBow-1]

Submitted for internal review