Added ability to specify allowed extensions for attachments.

[bellingeri]

Hi.

I've added the ability to define which extensions are accepted in attachments.

The default setting is set upon initial startup [setup.php] without prompting the user (to keep the installation streamlined) and can then be changed in [settings.php].

Previously, the accepted files were statically listed in the code (perhaps with some differences between the various files).

I had to comment out the mime/type verification section: I find it complex to ask the user to enter them.
Someone could instead provide a list of "extensions" to "mime/types" and check using that.
Comments are welcome!

I've also prepared translations for the added strings, but with automatic translators... not the best.

[Zavy86]

What happens when the update occurs until the new settings are available? Does it load an empty array or does it fail? (I haven't been able to test this yet; you might already know.)

[bellingeri]

Good question!
If the constant isn't defined in the config file, existing attachments won't be displayed, and you obviously won't be able to add more.
You need to go to the configuration and fill in the field...

[bellingeri]

Hi.
What do you think about providing a simple file for managing updates?
...even for future updates that require further configuration changes.

Something like this: update.php

Let me know...