This commit refactors account deletion spec by moving data creation to a helper
object DataGenerator.

ClientsController and TokenEndpointController are called from the outside,
so CSRF verification prevents them from normal operation.

closes #7062

closes #7043

message doesn't include Diaspora::Relayable anymore

* add port to pods
* remove url from person and link people with pod-table

See

- http://openid.net/specs/openid-connect-core-1_0.html#ClientAuthentication
- https://openid.net/specs/openid-connect-registration-1_0.html#ClientMetadata

- Add foreign_keys
- Remove unused classes/methods
- Fix pronto errors
- Add method to retrieve client id from name
- Remove TODO comments
- Fix unnecessary private key generation

- fix map controls in stream

- add coordinates in post_presenter
- add map to the SPV if location is provided
- add leaflet.js to render map and marker of position
- make coordinates available in frontend
- add map scss
- make stream post location clickable and redirect to the SPV
- prevent render map if no location data is provided
- add tests for coordinates
- use the leaflet gem instead of the JS assets
(#5813)

add tooltips in the frontend
fix a JS problem with empty hostname
use `find_in_batches` correctly
add a migration to clean up the pods table + unique index on hostname

* add a class for checking pod connectivity
* extend pod model to handle new functionality
* add an admin frontend to list pods and re-trigger checks manually
* add a daily worker to run through all the pods
* add unit tests for most of the new code

closes #6007

For example if they're already present
Also refactor StatusMessage XML specs

Added rspec test for og in status_message model

Added rspec test for og_html helper

Improved tests for opengraph embedding

deletes ActivityStream model and all it's references

update migration with the without_protection option to disable mass assignment protection

markdown link to their profile (fixes #2516)

add failing spec for #4160 / #2516

extend the spec a bit more

refactor mention handling in a status message

add method for filtering mentions by aspects

wire mention filtering into the status message model, adapt a few tests to
work properly

cosmetic changes

shorten helper methods

add changelog entry