Put the image editor into a scrollarea so the dialog doesn't screw up
when importing a large image file.
When importing a file add a filter to the file dialog to only show image
files.
By default, use the overwrite mode in the hex edit widget. This way text
and hex editor start in the same mode, making it less confusing to press
the INS key to change the mode.
When editing the data using the hex editor also update the text editor.
Allow the user to change between the text editor and the hex editor.
Allow the user to change between insert and overwrite mode in both
editors.
This makes it possible to enter any binary data into an empty cell.
Only show the old text edit widget when there is actually a text to be
edited. If the data is a image file show the image instead of some
random garbage. If it is some other binary data show the hex editor.
Store the data of a DB cell in a QByteArray, i.e. a binary data type,
instead of putting it in a QString, thus converting it to a UTF8 string.
Rewrite the reading and writing of DB cells to correctly handle binary
data containing 0x00 bytes.
Change the edit dialog to actually do all the data checks etc. on a
currently invisible QHexEdit widget instead of a QTextEdit.
All these changes combined make it possible to actually store binary
data without it being corrupted. You can for example import pictures
now, export them and actually open the exported file. So this is an
improvement.
Create a Qt Designer form file for the edit dialog.
Clean up the edit dialog code removing some not working and not used
functionality e.g. for blob editing.
