Made the random seeds in the UI more random

The random seeds in the UI were not so random on Windows.
Changed the UI such that a new random seed is chosen after generating a ROM.

common/mt19937-64.c

@@ -129,6 +129,11 @@ uint64_t mt_rand(uint64_t min, uint64_t max)
     return min + (genrand64_int64() % (max - min + 1));
 }
 
+uint64_t mt_rand64()
+{
+    return genrand64_int64();
+}
+
 double mt_rand_double()
 {
     return (genrand64_int64() >> 11) * (1.0/9007199254740992.0);

common/mt64.h

@@ -67,6 +67,8 @@ void mt_init(uint64_t seed);
 
 uint64_t mt_rand(uint64_t min, uint64_t max);
 
+uint64_t mt_rand64();
+
 int mt_rand_bool();
 
 double mt_rand_double();

ui/main-window.cpp

@@ -199,6 +199,7 @@ void MainWindow::handleButton()
                 "the ROM could not be created.");
     }
     this->saveConfig();
+    this->seed->random();
 }
 
 bool MainWindow::saveConfig()

ui/widgets.cpp

@@ -8,6 +8,7 @@
 #include <cinttypes>
 
 #include "dwr.h"
+#include "mt64.h"
 #include "widgets.h"
 
 CheckBox::CheckBox(const char flag, const QString &text, QWidget *parent) :
@@ -142,16 +143,23 @@ SeedEntry::SeedEntry(QWidget *parent) : ButtonEntry(parent)
     this->handleButton();
 }
 
-void SeedEntry::handleButton()
+void SeedEntry::random()
 {
     uint64_t seed;
     char seedString[21];
     srand(time(NULL));
     seed = ((uint64_t)rand() << 32) | ((uint64_t)rand() & 0xffffffffL);
+    mt_init(seed);
+    seed = mt_rand64();
     snprintf(seedString, 21, "%" PRIu64, seed);
     this->textBox->setText(QString(seedString));
 }
 
+void SeedEntry::handleButton()
+{
+    this->random();
+}
+
 uint64_t SeedEntry::getSeed()
 {
     uint64_t seed;

ui/widgets.h

@@ -92,6 +92,7 @@ class SeedEntry : public ButtonEntry {
     typedef ButtonEntry super;
     SeedEntry(QWidget *parent = 0);
     uint64_t getSeed();
+    void random();
 
 private slots:
     void handleButton();