Introduced input method hints for latin

On many cases especially latin input is wanted. Hint for these may,
e.g., help virtual keyboards on changing the layout to a western one.
Added a hint for requiring and another for preferring latin based
input.

Change-Id: I0ea79643665e25d9f916c3b8d0b7d7352843c2dc
Reviewed-by: Joona Petrell <joona.t.petrell@nokia.com>
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>

src/corelib/global/qnamespace.h

@@ -1298,6 +1298,8 @@ public:
         ImhDate = 0x80,
         ImhTime = 0x100,
 
+        ImhPreferLatin = 0x200,
+
         ImhDigitsOnly = 0x10000,
         ImhFormattedNumbersOnly = 0x20000,
         ImhUppercaseOnly = 0x40000,
@@ -1305,6 +1307,7 @@ public:
         ImhDialableCharactersOnly = 0x100000,
         ImhEmailCharactersOnly = 0x200000,
         ImhUrlCharactersOnly = 0x400000,
+        ImhLatinOnly = 0x800000,
 
         ImhExclusiveInputMask = 0xffff0000
     };

src/corelib/global/qnamespace.qdoc

@@ -2429,6 +2429,7 @@
 
     \value ImhDate                   The text editor functions as a date field.
     \value ImhTime                   The text editor functions as a time field.
+    \value ImhPreferLatin            Latin characters are preferred (but not required).
 
     Flags that restrict input (exclusive flags):
 
@@ -2439,6 +2440,7 @@
     \value ImhDialableCharactersOnly Only characters suitable for phone dialing are allowed.
     \value ImhEmailCharactersOnly    Only characters suitable for email addresses are allowed.
     \value ImhUrlCharactersOnly      Only characters suitable for URLs are allowed.
+    \value ImhLatinOnly              Only latin based input is allowed.
 
     Masks: