Rename the swift-format utility to swift-indent

This is to distinguish the C++ indenting functionality from the new formatter that is written in Swift.

test/swift-indent/main.swift.response

@@ -0,0 +1,36 @@
+// RUN: %swift-indent %s >%t.response
+// RUN: diff -u %s.response %t.response
+// RUN: %swift-indent -indent-width 2 %s >%t.response
+// RUN: diff -u %s.indent2.response %t.response
+// RUN: %swift-indent -use-tabs %s >%t.response
+// RUN: diff -u %s.tabs.response %t.response
+// RUN: %swift-indent -line-range 24:29 %s >%t.response
+// RUN: diff -u %s.lines.response %t.response
+// RUN: %swift-indent -indent-switch-case %s >%t.response
+// RUN: diff -u %s.indentswitch.response %t.response
+
+import Foundation
+
+func collatz(n: Int, m: String?) {
+    switch m {
+    case .some(let s):
+        print(s)
+    case .none:
+        print("nothing")
+    default:
+        print("not possible")
+        break
+    }
+    var r: Int
+    if n%2 == 0 {
+        r = n/2
+    } else {
+        r = 3*n+1
+    }
+    print("Number: \(r)")
+    if r == 1 {
+        print("Reached one!")
+    } else {
+        collatz(r)
+    }
+}