Logging: Add customizable logging backends and fmtlib based macros

* Change the logging backend to support multiple sinks through the
Backend Interface
* Add a new set of logging macros to use fmtlib instead.
* Qt: Compile as GUI application on windows to make the console hidden by
default. Add filter configuration and a button to open log location.
* SDL: Migrate to the new logging macros

src/citra_qt/configuration/config.cpp

@@ -231,6 +231,7 @@ void Config::ReadValues() {
     UISettings::values.confirm_before_closing = qt_config->value("confirmClose", true).toBool();
     UISettings::values.first_start = qt_config->value("firstStart", true).toBool();
     UISettings::values.callout_flags = qt_config->value("calloutFlags", 0).toUInt();
+    UISettings::values.show_console = qt_config->value("showConsole", false).toBool();
 
     qt_config->beginGroup("Multiplayer");
     UISettings::values.nickname = qt_config->value("nickname", "").toString();
@@ -391,6 +392,7 @@ void Config::SaveValues() {
     qt_config->setValue("confirmClose", UISettings::values.confirm_before_closing);
     qt_config->setValue("firstStart", UISettings::values.first_start);
     qt_config->setValue("calloutFlags", UISettings::values.callout_flags);
+    qt_config->setValue("showConsole", UISettings::values.show_console);
 
     qt_config->beginGroup("Multiplayer");
     qt_config->setValue("nickname", UISettings::values.nickname);

src/citra_qt/configuration/configure_debug.cpp

@@ -2,13 +2,26 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#include <QDesktopServices>
+#include <QUrl>
 #include "citra_qt/configuration/configure_debug.h"
+#include "citra_qt/debugger/console.h"
+#include "citra_qt/ui_settings.h"
+#include "common/file_util.h"
+#include "common/logging/backend.h"
+#include "common/logging/filter.h"
+#include "common/logging/log.h"
+#include "core/core.h"
 #include "core/settings.h"
 #include "ui_configure_debug.h"
 
 ConfigureDebug::ConfigureDebug(QWidget* parent) : QWidget(parent), ui(new Ui::ConfigureDebug) {
     ui->setupUi(this);
     this->setConfiguration();
+    connect(ui->open_log_button, &QPushButton::pressed, []() {
+        QString path = QString::fromStdString(FileUtil::GetUserPath(D_LOGS_IDX));
+        QDesktopServices::openUrl(QUrl::fromLocalFile(path));
+    });
 }
 
 ConfigureDebug::~ConfigureDebug() {}
@@ -17,11 +30,20 @@ void ConfigureDebug::setConfiguration() {
     ui->toggle_gdbstub->setChecked(Settings::values.use_gdbstub);
     ui->gdbport_spinbox->setEnabled(Settings::values.use_gdbstub);
     ui->gdbport_spinbox->setValue(Settings::values.gdbstub_port);
+    ui->toggle_console->setEnabled(!Core::System::GetInstance().IsPoweredOn());
+    ui->toggle_console->setChecked(UISettings::values.show_console);
+    ui->log_filter_edit->setText(QString::fromStdString(Settings::values.log_filter));
 }
 
 void ConfigureDebug::applyConfiguration() {
     Settings::values.use_gdbstub = ui->toggle_gdbstub->isChecked();
     Settings::values.gdbstub_port = ui->gdbport_spinbox->value();
+    UISettings::values.show_console = ui->toggle_console->isChecked();
+    Settings::values.log_filter = ui->log_filter_edit->text().toStdString();
+    Debugger::ToggleConsole();
+    Log::Filter filter;
+    filter.ParseFilterString(Settings::values.log_filter);
+    Log::SetGlobalFilter(filter);
     Settings::Apply();
 }
 

src/citra_qt/configuration/configure_debug.ui

@@ -72,6 +72,47 @@
      </item>
     </layout>
    </item>
+   <item>
+    <widget class="QGroupBox" name="groupBox_2">
+     <property name="title">
+      <string>Logging</string>
+     </property>
+     <layout class="QVBoxLayout" name="verticalLayout">
+      <item>
+       <layout class="QHBoxLayout" name="horizontalLayout">
+        <item>
+         <widget class="QLabel" name="label">
+          <property name="text">
+           <string>Global Log Filter</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QLineEdit" name="log_filter_edit"/>
+        </item>
+       </layout>
+      </item>
+      <item>
+       <layout class="QHBoxLayout" name="horizontalLayout_2">
+        <item>
+         <widget class="QCheckBox" name="toggle_console">
+          <property name="text">
+           <string>Show Log Console (Windows Only)</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QPushButton" name="open_log_button">
+          <property name="text">
+           <string>Open Log Location</string>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </item>
+     </layout>
+    </widget>
+   </item>
    <item>
     <spacer name="verticalSpacer">
      <property name="orientation">