+ Fleece.Redis

[wallymathieu]

• [x] First iteration of codec for redis
• [x] fieldStr
• [x] fieldInt64
• [x] fieldBool
• [x] Tests of simple mappings

First step to Redis compatible Fleece. Thought here is that this would actually be sweet to max with ofJson/toJson.

[wallymathieu]

It's not generic enough due to the type constraints on how redis works