Configuration format v1 (#1230)

* Initial pass at refactoring config (not finished)

* Don't forget current state and EDU servers

* More shifting around

* Update server key API tests

* Fix roomserver test

* Fix more tests

* Further tweaks

* Fix current state server test (sort of)

* Maybe fix appservices

* Fix client API test

* Include database connection string in database options

* Fix sync API build

* Update config test

* Fix unit tests

* Fix federation sender build

* Fix gobind build

* Set Listen address for all services in HTTP monolith mode

* Validate config, reinstate appservice derived in directory, tweaks

* Tweak federation API test

* Set MaxOpenConnections/MaxIdleConnections to previous values

* Update generate-config

internal/sqlutil/sql.go

@@ -19,7 +19,6 @@ import (
 	"errors"
 	"fmt"
 	"runtime"
-	"time"
 
 	"go.uber.org/atomic"
 )
@@ -107,13 +106,6 @@ func SQLiteDriverName() string {
 	return "sqlite3"
 }
 
-// DbProperties functions return properties used by database/sql/DB
-type DbProperties interface {
-	MaxIdleConns() int
-	MaxOpenConns() int
-	ConnMaxLifetime() time.Duration
-}
-
 // TransactionWriter allows queuing database writes so that you don't
 // contend on database locks in, e.g. SQLite. Only one task will run
 // at a time on a given TransactionWriter.