Unicode tool: use unsigned values for the bitfields

On MSVC the values stored end up as negative.

Conflicts resolved in cherry-pick:
  - The emoji-data code didn't exist in this branch

Task-number: QTBUG-132902
Pick-to: 6.5
Change-Id: I963c57c34479041911c1364a1100d04998bdfaed
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit 62685375a2d71fa34015faac76f03e709e4217c7)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit 09b06a740dd5e2ea08b49f76a2c384e6eb6fa6c6)

util/unicode/main.cpp

@@ -1000,12 +1000,12 @@ struct PropertyFlags {
     }
     // from UnicodeData.txt
     uchar combiningClass : 8;
-    QChar::Category category : 5;
-    QChar::Direction direction : 5;
+    uchar category : 5; // QChar::Category, but unsigned
+    uchar direction : 5; // QChar::Direction, but unsigned
     // from ArabicShaping.txt
-    QChar::JoiningType joining : 3;
+    uchar joining : 3; // QChar::JoiningType, but unsigned
     // from DerivedAge.txt
-    QChar::UnicodeVersion age : 5;
+    uchar age : 5; // QChar::UnicodeVersion, but unsigned
     // From EastAsianWidth.txt
     EastAsianWidth eastAsianWidth = EastAsianWidth::N;
     int digitValue = -1;