Add exports + add self hosted fingerprint importer

[UrielCh]

List of changes:

• @types/axios is a long time deprecated, axios contains his own types.
• Add koa as dev dependency, koa is the smallest full spec http server.
• Starting script/importer.ts will listen to port 3000 for incoming visitor, and will dump fp data as ${os}-${browser}-${hash}.json
• Replace a crypto.createHash('md5') by a helper.md5()
• Add a toto in the comment to sort DeviceDescriptor keys before generating UUID
• Fix ProxyServer interface, proxyType and ipType are optional
• Add DeviceDescriptor, UserAgentHelper, OSTypes, BrowserTypes, DeviceDescriptorHelper exports