Coco upgrade

This is a tracking issue for the coco upgrade. Much of the stuff in this list are "would-be-nice" (i.e. not all of the things listed here will likely be resolved).

## Outrigger merger

* [X] #246
* Jinja2 templating of default state files (i.e. kotekan configs)
* client-fetch of endpoints from daemon via `COCO_BACKEND` envar + the `get-coco-config` LocalEndpoint
* endpoint latency reporting
* mapping version of `save_to_state` in endpoint config

## Build system / CI / test suite

* [ ] #252
* [X] #262
* [X] #279
* [X] #282
* [ ] #294
* [X] #257
* [X] #258

## Daemon

### Features
* [ ] #201
* [ ] #238
* [ ] #243
* [X] #259
* [ ] #263
* [ ] #264
* [ ] #274
* [X] #275
* [X] #276

### Bugs
* [ ] #176
* [ ] #204
* [ ] #254
* [X] #265
* [X] #270
* [X] #272
* [X] #273
* [X] #277
* [X] #283
* [X] #288
* [x] #295
* [x] #89
* [x] #290

## Endpoint spec
* [ ] #75
* [ ] #77
* [ ] #106
* [ ] #107
* [ ] #160
* [ ] #224
* [ ] #200
* [ ] #225
* [ ] #293

## Client

* [ ] #98
* [ ] #100
* [ ] #189
* [ ] #190
* [ ] #211
* [ ] #217
* [ ] #218
* [ ] #226
* [ ] #248
* [x] #292
* [ ] #293