fix for :fetch_initial_posts

See merge request pleroma/pleroma!2266

A warning was added, but their were some newlines and whitespaces missing which broke the rendering of the setting. I've added them now

ActivityPub actions & side-effects in transaction

Closes #1482

See merge request pleroma/pleroma!2089

Bump copyright

See merge request pleroma/pleroma!2265

Done via the following command:
git diff fcd5dd25 --stat --name-only | xargs sed -i '/Pleroma Authors/c# Copyright © 2017-2020 Pleroma Authors <https:\/\/pleroma.social\/>'

Done via the following command:
git diff 1e6c102b --stat --name-only | cat - | xargs sed -i 's/2017-2018 Pleroma Authors/2017-2019 Pleroma Authors/'

DOCS Add warning for fetch_initial_posts + more explicit distinction between OTP and from source

See merge request pleroma/pleroma!2262

Add warning to the fetch_initial_posts setting. Now we sometimes have people who enable this without realising the consequences (tons of posts being fetcht as each fetch makes Pleroma discover new users)
I also made a more explicit distinction between OTP and from source installs in the general explanation

Cap the number of requested statuses in timelines to 40 and rate limit them

See merge request pleroma/pleroma!2253

When multiple requests are processed by rate limiter plug at the same
time and the bucket is not yet initialized, both would try to initialize
the bucket resulting in an internal server error.

RateLimiter improvements: runtime configurability, no default limits in tests

See merge request pleroma/pleroma!2250

deps: update cachex to 3.2.0

See merge request pleroma/pleroma!2259

MastoFE: Bundle 2020-01-20

See merge request pleroma/pleroma!2257

Adding streamer group & Oban crontab child to descriptions.exs

Closes #1592

See merge request pleroma/pleroma!2258

Update PleromaFE bundle for the 2.0 release

See merge request pleroma/pleroma!2255

Update AdminFE build

See merge request pleroma/pleroma!2254

- Removed Grouped Reports; API needs proper architecture/refactor
- Cannot set Tesla adapter in AdminFE as it's not safe yet
- Layout/rendering improvements

add confirm field to filtered params

See merge request !2251

Removing unnecessary groups from descriptions.exs

See merge request !2247

Admin API: `/api/pleroma/admin/statuses` (accepts `godmode` and `local_only`)

Closes #1550

See merge request !2192

Admin API: filter out boosts from recent statuses

Closes #1589

See merge request !2248

Admin API: Exclude boosts from `GET /api/pleroma/admin/users/:nickname/statuses` and `GET /api/pleroma/admin/instance/:instance/statuses`

Admin API: `GET /api/pleroma/admin/statuses` - list all statuses (accepts `godmode` and `local_only`)