Debugger: Compile with QT_NO_CAST_FROM_ASCII.

(except gdbmi.cpp, name_demangler.cpp). Remove some unneeded
conversions, change some maps to take QByteArray keys.

Change-Id: I010f1251998a441fe5c8c87901b1e0c277c0391c
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/debugger/gdb/localplaingdbadapter.cpp

@@ -165,7 +165,7 @@ void LocalPlainGdbAdapter::checkForReleaseBuild()
     // "30 .debug_info   00087d36  00000000  00000000  0006bbd5  2**0\n"
     // " CONTENTS, READONLY, DEBUGGING"
     if (ba.contains("Sections:") && !ba.contains(".debug_info")) {
-        showMessageBox(QMessageBox::Information, "Warning",
+        showMessageBox(QMessageBox::Information, tr("Warning"),
            tr("This does not seem to be a \"Debug\" build.\n"
               "Setting breakpoints by file name and line number may fail."));
     }