Debugger: Split DebuggerEncoding enum

... into a string specifying a kind of encoding (utf8, latin1),
an optional bytesize (2-byte integers, 4-byte integers) and a
flag whether the displayed value should get "..." around it.

Scales better than adding an enum value for each new combination.

Change-Id: Iffcb1e2f148f12da96e165559a976bd34026c649
Reviewed-by: David Schulz <david.schulz@theqtcompany.com>

src/plugins/debugger/watchhandler.cpp

@@ -1788,7 +1788,7 @@ void WatchItem::parseWatchData(const GdbMi &input)
     };
 
     auto arrayDecoder = [itemAdder](const WatchData &childTemplate,
-            const QByteArray &encodedData, int encoding) {
+            const QByteArray &encodedData, const DebuggerEncoding &encoding) {
         decodeArrayData(itemAdder, childTemplate, encodedData, encoding);
     };