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_bsd.go

@@ -0,0 +1,12 @@
+// +build darwin dragonfly freebsd netbsd openbsd
+
+package terminal
+
+import "golang.org/x/sys/unix"
+
+const ioctlReadTermios = unix.TIOCGETA
+
+func isTerminal(fd int) bool {
+	_, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
+	return err == nil
+}

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
+	}
+}

pkg/helpers/terminal/terminal_check_no_terminal.go

@@ -0,0 +1,11 @@
+// +build js nacl plan9
+
+package terminal
+
+import (
+	"io"
+)
+
+func IsTerminal(w io.Writer) bool {
+	return false
+}

pkg/helpers/terminal/terminal_check_solaris.go

@@ -0,0 +1,11 @@
+package terminal
+
+import (
+	"golang.org/x/sys/unix"
+)
+
+// IsTerminal returns true if the given file descriptor is a terminal.
+func isTerminal(fd int) bool {
+	_, err := unix.IoctlGetTermio(fd, unix.TCGETA)
+	return err == nil
+}

pkg/helpers/terminal/terminal_check_unix.go

@@ -0,0 +1,12 @@
+// +build linux aix zos
+
+package terminal
+
+import "golang.org/x/sys/unix"
+
+const ioctlReadTermios = unix.TCGETS
+
+func isTerminal(fd int) bool {
+	_, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
+	return err == nil
+}

pkg/helpers/terminal/terminal_check_windows.go

@@ -0,0 +1,27 @@
+// +build windows
+
+package terminal
+
+import (
+	"io"
+	"os"
+
+	"golang.org/x/sys/windows"
+)
+
+func IsTerminal(w io.Writer) bool {
+	switch v := w.(type) {
+	case *os.File:
+		handle := windows.Handle(v.Fd())
+		var mode uint32
+		if err := windows.GetConsoleMode(handle, &mode); err != nil {
+			return false
+		}
+		mode |= windows.ENABLE_VIRTUAL_TERMINAL_PROCESSING
+		if err := windows.SetConsoleMode(handle, mode); err != nil {
+			return false
+		}
+		return true
+	}
+	return false
+}