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/helpers/terminal/terminal_check_general.go

@@ -0,0 +1,17 @@
+// +build !windows,!nacl,!plan9
+
+package terminal
+
+import (
+	"io"
+	"os"
+)
+
+func IsTerminal(w io.Writer) bool {
+	switch v := w.(type) {
+	case *os.File:
+		return isTerminal(int(v.Fd()))
+	default:
+		return false
+	}
+}