[Pleroma.Web.MastodonAPI.MastodonAPIController]: Add rights to initial_state

See merge request pleroma/pleroma!236

Related to mastofe#20

Return empty array from /api/qvitter/mutes.json

See merge request !234

Add more configurability to how blocks work

See merge request pleroma/pleroma!203

config: add application/xml mimetype support.

See merge request pleroma/pleroma!228

Empty 2.4.x endpoints and ``api/v2/search``

See merge request pleroma/pleroma!214

Hnng!

mrf simple: add accept lists

See merge request pleroma/pleroma!231

accept lists supplement reject lists by requiring that any message accepted by contained
by the accept list.

in other words, this functionality can be used to implement instances similar to
awoo.space.

Add streaming to media tabs of federated and local TLs

See merge request pleroma/pleroma!225

fix follow relationship leaks when blocked

See merge request pleroma/pleroma!230

activitypub: support filtering activities by whether or not they are a reply (closes #109)

Closes #109

See merge request pleroma/pleroma!226

handle ActivityStreams 2.0 contentMap

See merge request pleroma/pleroma!229

this is needed for activitypub conformance

ref #213

application/xml is the older xml mimetype.  some legacy scripts make use of it,
as well as common use for debugging with curl and other tools.  so it makes sense
to have it alongside text/xml.

Comment for Old Servers

See merge request pleroma/pleroma!224