Merge SQLLogDock and MainWindow

Move the SQL log dock into the main window. This means the log dock is
now included in the MainWindow.ui file and its logic in MainWindow,cpp.

src/src.pro

@@ -13,7 +13,6 @@ CONFIG += qt \
 HEADERS += \
     sqlitedb.h \
     sqlbrowser_util.h \
-    SQLLogDock.h \
     MainWindow.h \
     SQLiteSyntaxHighlighter.h \
     CreateIndexDialog.h \
@@ -29,7 +28,6 @@ HEADERS += \
 SOURCES += \
     sqlitedb.cpp \
     sqlbrowser_util.c \
-    SQLLogDock.cpp \
     main.cpp \
     MainWindow.cpp \
     SQLiteSyntaxHighlighter.cpp \