[chore] Global server configuration overhaul (#575)

* move config flag names and usage to config package, rewrite config package to use global Configuration{} struct

Signed-off-by: kim <grufwub@gmail.com>

* improved code comment

Signed-off-by: kim <grufwub@gmail.com>

* linter

Signed-off-by: kim <grufwub@gmail.com>

* fix unmarshaling

Signed-off-by: kim <grufwub@gmail.com>

* remove kim's custom go compiler changes

Signed-off-by: kim <grufwub@gmail.com>

* generate setter and flag-name functions, implement these in codebase

Signed-off-by: kim <grufwub@gmail.com>

* update deps

Signed-off-by: kim <grufwub@gmail.com>

* small change

Signed-off-by: kim <grufwub@gmail.com>

* appease the linter...

Signed-off-by: kim <grufwub@gmail.com>

* move configuration into ConfigState structure, ensure reloading to/from viper settings to keep in sync

Signed-off-by: kim <grufwub@gmail.com>

* lint

Signed-off-by: kim <grufwub@gmail.com>

* update code comments

Signed-off-by: kim <grufwub@gmail.com>

* fix merge issue

Signed-off-by: kim <grufwub@gmail.com>

* fix merge issue

Signed-off-by: kim <grufwub@gmail.com>

* improved version string (removes time + go version)

Signed-off-by: kim <grufwub@gmail.com>

* fix version string build to pass test script + consolidate logic in func

Signed-off-by: kim <grufwub@gmail.com>

* add license text, update config.Defaults comment

Signed-off-by: kim <grufwub@gmail.com>

* add license text to generated config helpers file

Signed-off-by: kim <grufwub@gmail.com>

* defer unlock on config.Set___(), to ensure unlocked on panic

Signed-off-by: kim <grufwub@gmail.com>

* make it more obvious which cmd flags are being attached

Signed-off-by: kim <grufwub@gmail.com>

internal/federation/authenticate.go

@@ -29,7 +29,6 @@ import (
 	"strings"
 
 	"github.com/sirupsen/logrus"
-	"github.com/spf13/viper"
 
 	"github.com/go-fed/httpsig"
 	"github.com/superseriousbusiness/activity/pub"
@@ -168,8 +167,7 @@ func (f *federator) AuthenticateFederatedRequest(ctx context.Context, requestedU
 	requestingRemoteAccount := &gtsmodel.Account{}
 	requestingLocalAccount := &gtsmodel.Account{}
 	requestingHost := requestingPublicKeyID.Host
-	host := viper.GetString(config.Keys.Host)
-	if strings.EqualFold(requestingHost, host) {
+	if host := config.GetHost(); strings.EqualFold(requestingHost, host) {
 		// LOCAL ACCOUNT REQUEST
 		// the request is coming from INSIDE THE HOUSE so skip the remote dereferencing
 		l.Tracef("proceeding without dereference for local public key %s", requestingPublicKeyID)