Related to the work done in https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/818

Doing this further simplifies examples/vars.yml.

We're trying to move away from implementation-specific variables,
hoping for a clean (implementation-neutral) examples/vars.yml file.

Doing this seems more reasonable and simpler.

The goal is to have a single variable which tells us which homeserver
software is in use. Much simpler than having if/elif/elif checks for
variables like (`matrix_synapse_enabled` and `matrix_dendrite_enabled`, etc.)
everywhere.

This brings dendrite.yaml up to date and cleans things up a bit.

Discussed in https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1514

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1480

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1242

* Copy/update mautrix_facebook group_vars to mautrix_twitter
* Replace facebook -> twitter, fb -> twt, remove presence var
* Enable playbook in setup.yml

This is useful when Synapse is using a worker setup. In that case,
we don't want appservices to connect to `matrix-synapse:8008`, because
not all APIs are exposed there.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1449

Add a self-build option for the Dimension Dockerfile.
 - This helps further support arm64 hosts (i.e. A1.Flex w/Oracle)

This change forces ansible to decrypt the variable with ansible-vault if encrypted, to avoid the error '{"msg": "Unexpected templating type error occurred on ({{ matrix_synapse_macaroon_secret_key | password_hash('sha512') }}): secret must be unicode or bytes, not ansible.parsing.yaml.objects.AnsibleVaultEncryptedUnicode"}'
Every other variable in the playbook was found to have no problems with encryption.
The change has no negative impact on non-encrypted matrix_synapse_macaroon_secret_key.

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1397
and https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1399

* fix for string concatenation on matrix_synapse_account_threepid_delegates_email and matrix_synapse_account_threepid_delegates_msisdn

* .editorconfig should not be ignored

* Restore .gitignore

Co-authored-by: b <b@b>
Co-authored-by: Slavi Pantaleev <slavi@devture.com>

https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1311#issuecomment-945718866

Also fixes the appservice and homeserver tokens for the Googlechat bridge,
so that they're not the same as the ones for the Hangouts bridge.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1322

This bridge doesn't support SQLite anyway, so it's not necessary
to carry around configuration fields and code for migration from SQLite
to Postgres. There's nothing to migrate.