Feature: Wintype-specific options in configuration files

- Add support of window-type-specific options (fade, shadow, and
  opacity) in configuration file parsing. Syntax shown in
  compton.sample.conf.

- Replace wintype_name() with an array of window type names. Code
  clean-up.

src/compton.h

@@ -273,6 +273,18 @@ set_ignore(Display *dpy, unsigned long sequence);
 static int
 should_ignore(Display *dpy, unsigned long sequence);
 
+/**
+ * Set a Bool array of all wintypes to true.
+ */
+static void
+wintype_arr_enable(Bool arr[]) {
+  wintype i;
+
+  for (i = 0; i < NUM_WINTYPES; ++i) {
+    arr[i] = True;
+  }
+}
+
 /**
  * Allocate the space and copy a string.
  */