Manager refactor, part 1 (#4298)

* Move BackupDatabase and AnonymiseDatabase to internal/manager
* Rename config.Instance to config.Config
* Rename FFMPEG
* Rework manager and initialization process
* Fix Makefile
* Tweak phasher
* Fix config races
* Fix setup error not clearing

internal/manager/config/config_concurrency_test.go

@@ -7,7 +7,7 @@ import (
 
 // should be run with -race
 func TestConcurrentConfigAccess(t *testing.T) {
-	i := GetInstance()
+	i := InitializeEmpty()
 
 	const workers = 8
 	const loops = 200
@@ -16,13 +16,12 @@ func TestConcurrentConfigAccess(t *testing.T) {
 		wg.Add(1)
 		go func(wk int) {
 			for l := 0; l < loops; l++ {
-				if err := i.SetInitialMemoryConfig(); err != nil {
+				if err := i.SetInitialConfig(); err != nil {
 					t.Errorf("Failure setting initial configuration in worker %v iteration %v: %v", wk, l, err)
 				}
 
 				i.HasCredentials()
 				i.ValidateCredentials("", "")
-				i.GetCPUProfilePath()
 				i.GetConfigFile()
 				i.GetConfigPath()
 				i.GetDefaultDatabaseFilePath()