patch 9.1.0754: fixed order of items in insert-mode completion menu

Problem:  fixed order of items in insert-mode completion menu
Solution: Introduce the 'completeitemalign' option with default
          value "abbr,kind,menu" (glepnir).

Adding an new option `completeitemalign` abbr is `cia` to custom
the complete-item order in popupmenu.

closes: #14006
closes: #15760

Signed-off-by: glepnir <glephunter@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/vim.h b/src/vim.h
index 9c1434c..ebca6ae 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -2373,6 +2373,17 @@
 } funcerror_T;
 
 /*
+ * Array indexes used for cp_text[].
+ */
+typedef enum {
+    CPT_ABBR,		// "abbr"
+    CPT_KIND,		// "kind"
+    CPT_MENU,		// "menu"
+    CPT_INFO,		// "info"
+    CPT_COUNT,		// Number of entries
+} cpitem_T;
+
+/*
  * Type for the callback function that is invoked after an option value is
  * changed to validate and apply the new value.
  *