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/option.h b/src/option.h
index fba2672..ef39031 100644
--- a/src/option.h
+++ b/src/option.h
@@ -513,6 +513,8 @@
 EXTERN int	p_confirm;	// 'confirm'
 #endif
 EXTERN int	p_cp;		// 'compatible'
+EXTERN char_u	*p_cia;		// 'completeitemalign'
+EXTERN unsigned cia_flags;	// order flags of 'completeitemalign'
 EXTERN char_u	*p_cot;		// 'completeopt'
 EXTERN unsigned	cot_flags;	// flags from 'completeopt'
 // Keep in sync with p_cot_values in optionstr.c