This is a first rough implementation of QScintilla support as SQL text
editor.
It should work mostly and build fine with qmake as well as cmake. The
new code supports all the features of the old one plus adding a few
subtle improvements. The main point of this, however, is reducing the
code we have to maintain and making it easier to add new features to the
editor.
Any SqlTextEdit object has its SQL syntax highlighter anyway, so it
makes sense to move the syntax highlighter object inside the text edit
class instead of maintining somewhere else. This hopefully makes the
code a bit easier to maintain.
When running a SQL statement the column widths of the result table view
are set to fit their contents automatically. However, for very long
values this makes the table hard to navigate. This is why this commit
introduces a maximum column width while still trying to fit each column
to its contents.
See issue #79, point 2.
When the user selects multiple lines of SQL code and hits F5 to execute
them the execution stops after the first line because we use the
selectedText() method of the QTextCursor class to get the selected text
and this method returns Unicode U+2029 paragraph separator characters
instead of newline \n characters.
(see http://qt-project.org/doc/qt-4.8/qtextcursor.html#selectedText)
Fix this by replacing these by regular newline characters to.
