Make all packages internal

The Go packages of this project were written solely for the use within the project. Making them internal avoids them
unintentionally becoming part of the public API, which would result in a greatly increased potential maintenance and support
burden and limitations on further development work.

It would be interesting to eventually evaluate whether any components of the internal API might be useful to others and
expose them intentionally as they reach a state of relative stability. However, for now the public API should be
considered to be the:

- Configuration file format
- Index source list format
- Library Manager index format

Author: per1234

libraries/clamav.go renamed to internal/libraries/clamav.go

@@ -28,7 +28,7 @@ import (
 	"regexp"
 	"strings"
 
-	"arduino.cc/repository/libraries/metadata"
+	"arduino.cc/repository/internal/libraries/metadata"
 )
 
 // FromLibraryToRelease extract a Release from LibraryMetadata. LibraryMetadata must be

libraries/db/db.go renamed to internal/libraries/db/db.go

@@ -29,8 +29,8 @@ import (
 	"path/filepath"
 	"testing"
 
-	"arduino.cc/repository/libraries/db"
-	"arduino.cc/repository/libraries/gitutils"
+	"arduino.cc/repository/internal/libraries/db"
+	"arduino.cc/repository/internal/libraries/gitutils"
 	"github.com/go-git/go-git/v5"
 	"github.com/stretchr/testify/require"
 )

libraries/db/dependencies_test.go renamed to internal/libraries/db/dependencies_test.go

@@ -28,8 +28,8 @@ import (
 	"path/filepath"
 	"regexp"
 
-	"arduino.cc/repository/libraries/metadata"
-	"arduino.cc/repository/libraries/zip"
+	"arduino.cc/repository/internal/libraries/metadata"
+	"arduino.cc/repository/internal/libraries/zip"
 )
 
 // ZipRepo creates a ZIP archive of the repo folder and returns its path.

libraries/db/index.go renamed to internal/libraries/db/index.go

@@ -28,11 +28,11 @@ import (
 	"os"
 	"path/filepath"
 
-	"arduino.cc/repository/libraries/db"
+	"arduino.cc/repository/internal/libraries/db"
 
 	"fmt"
 
-	"arduino.cc/repository/libraries/metadata"
+	"arduino.cc/repository/internal/libraries/metadata"
 	"github.com/go-git/go-git/v5"
 )
 

libraries/db/library.go renamed to internal/libraries/db/library.go

@@ -30,7 +30,7 @@ import (
 	"os/exec"
 	"path/filepath"
 
-	"arduino.cc/repository/libraries/file"
+	"arduino.cc/repository/internal/libraries/file"
 )
 
 // Directory creates a new zip archive that contains a copy of "rootFolder" into "zipFile".

libraries/db/versioning.go renamed to internal/libraries/db/versioning.go

@@ -32,10 +32,10 @@ import (
 	"os"
 	"path/filepath"
 
-	"arduino.cc/repository/libraries"
-	"arduino.cc/repository/libraries/db"
-	"arduino.cc/repository/libraries/gitutils"
-	"arduino.cc/repository/libraries/hash"
+	"arduino.cc/repository/internal/libraries"
+	"arduino.cc/repository/internal/libraries/db"
+	"arduino.cc/repository/internal/libraries/gitutils"
+	"arduino.cc/repository/internal/libraries/hash"
 	cc "github.com/arduino/golang-concurrent-workers"
 	"github.com/go-git/go-git/v5"
 	"github.com/go-git/go-git/v5/plumbing"