Remove unnecessary includes

Hopefully this reduces the compile time a little bit.

src/EditDialog.cpp

@@ -10,7 +10,6 @@
 #include <QShortcut>
 #include <QImageReader>
 #include <QBuffer>
-//#include <QStringBuilder>
 #include <QModelIndex>
 
 EditDialog::EditDialog(QWidget* parent)

src/ExportDataDialog.cpp

@@ -2,7 +2,6 @@
 #include "ui_ExportDataDialog.h"
 #include "sqlitedb.h"
 #include "Settings.h"
-#include "sqlitetablemodel.h"
 #include "sqlite.h"
 #include "FileDialog.h"
 

src/ExportSqlDialog.cpp

@@ -1,9 +1,6 @@
 #include "ExportSqlDialog.h"
 #include "ui_ExportSqlDialog.h"
 #include "sqlitedb.h"
-#include "PreferencesDialog.h"
-#include "sqlitetablemodel.h"
-#include "sqlite.h"
 #include "FileDialog.h"
 
 #include <QFile>

src/ExtendedTableWidget.h

@@ -2,11 +2,12 @@
 #define EXTENDEDTABLEWIDGET_H
 
 #include <QTableView>
-#include "FilterTableHeader.h"
 #include <QSet>
 #include <QDropEvent>
 #include <QDragMoveEvent>
 
+class FilterTableHeader;
+
 class ExtendedTableWidget : public QTableView
 {
     Q_OBJECT

src/MainWindow.cpp

@@ -20,6 +20,7 @@
 #include "SqlUiLexer.h"
 #include "FileDialog.h"
 #include "ColumnDisplayFormatDialog.h"
+#include "FilterTableHeader.h"
 
 #include <QFile>
 #include <QApplication>

src/MainWindow.h

@@ -1,7 +1,6 @@
 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H
 
-#include "sqltextedit.h"
 #include "sqlitedb.h"
 #include "RemoteDatabase.h"
 #include "PlotDock.h"
@@ -11,7 +10,6 @@
 
 class QDragEnterEvent;
 class EditDialog;
-class PlotDock;
 class QIntValidator;
 class QLabel;
 class QModelIndex;

src/SqlExecutionArea.cpp

@@ -1,7 +1,6 @@
 #include "SqlExecutionArea.h"
 #include "ui_SqlExecutionArea.h"
 #include "sqltextedit.h"
-#include "ExtendedTableWidget.h"
 #include "sqlitetablemodel.h"
 #include "sqlitedb.h"
 #include "Settings.h"

src/SqlExecutionArea.h

@@ -1,17 +1,14 @@
 #ifndef SQLEXECUTIONAREA_H
 #define SQLEXECUTIONAREA_H
 
-#include "sqltextedit.h"
-
 #include <QWidget>
 
-#include "ExtendedTableWidget.h"
-
 class SqlTextEdit;
 class SqliteTableModel;
 class DBBrowserDB;
 class QMenu;
 class QTextEdit;
+class ExtendedTableWidget;
 
 namespace Ui {
 class SqlExecutionArea;