Massive UX rewrite

- Ditch multiple libraries for progressbar, spinner, colors and replace
  with pterm
- Detect when running on terminal and disable automatically spinner
- Add support for multiple progress bars
- Huge rewrite of the configuration part. No more crazy stuff with viper
  CLI commands now correctly overrides default config file as expected
- Limit banner to be displayed on relevant parts

Fixes #211
Fixes #105
Fixes #247
Fixes #233

pkg/compiler/backend/backend_suite_test.go

@@ -18,8 +18,7 @@ package backend_test
 import (
 	"testing"
 
-	. "github.com/mudler/luet/cmd"
-	config "github.com/mudler/luet/pkg/config"
+	. "github.com/mudler/luet/cmd/util"
 
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
@@ -27,6 +26,6 @@ import (
 
 func TestSolver(t *testing.T) {
 	RegisterFailHandler(Fail)
-	LoadConfig(config.LuetCfg)
+	LoadConfig()
 	RunSpecs(t, "Backend Suite")
 }

pkg/compiler/backend/common.go

@@ -53,7 +53,7 @@ func runCommand(cmd *exec.Cmd) error {
 	cmd.Stderr = writer
 
 	if buffered {
-		Spinner(22)
+		Spinner(32)
 		defer SpinnerStop()
 	}