Implement Cobra CLI tooling, Viper config tooling (#336)

* start pulling out + replacing urfave and config

* replace many many instances of config

* move more stuff => viper

* properly remove urfave

* move some flags to root command

* add testrig commands to root

* alias config file keys

* start adding cli parsing tests

* reorder viper init

* remove config path alias

* fmt

* change config file keys to non-nested

* we're more or less in business now

* tidy up the common func

* go fmt

* get tests passing again

* add note about the cliparsing tests

* reorganize

* update docs with changes

* structure cmd dir better

* rename + move some files around

* fix dangling comma

vendor/github.com/inconshreveable/mousetrap/trap_windows_1.4.go

@@ -0,0 +1,46 @@
+// +build windows
+// +build go1.4
+
+package mousetrap
+
+import (
+	"os"
+	"syscall"
+	"unsafe"
+)
+
+func getProcessEntry(pid int) (*syscall.ProcessEntry32, error) {
+	snapshot, err := syscall.CreateToolhelp32Snapshot(syscall.TH32CS_SNAPPROCESS, 0)
+	if err != nil {
+		return nil, err
+	}
+	defer syscall.CloseHandle(snapshot)
+	var procEntry syscall.ProcessEntry32
+	procEntry.Size = uint32(unsafe.Sizeof(procEntry))
+	if err = syscall.Process32First(snapshot, &procEntry); err != nil {
+		return nil, err
+	}
+	for {
+		if procEntry.ProcessID == uint32(pid) {
+			return &procEntry, nil
+		}
+		err = syscall.Process32Next(snapshot, &procEntry)
+		if err != nil {
+			return nil, err
+		}
+	}
+}
+
+// StartedByExplorer returns true if the program was invoked by the user double-clicking
+// on the executable from explorer.exe
+//
+// It is conservative and returns false if any of the internal calls fail.
+// It does not guarantee that the program was run from a terminal. It only can tell you
+// whether it was launched from explorer.exe
+func StartedByExplorer() bool {
+	pe, err := getProcessEntry(os.Getppid())
+	if err != nil {
+		return false
+	}
+	return "explorer.exe" == syscall.UTF16ToString(pe.ExeFile[:])
+}