xF2 Add-on AndyB Attachment editor 1.7

Attachment editor v1.7 changes:

Remove no longer used code in a template.

Attachment editor v1.6 changes:

Improved thumbnail image resolution.

Attachment editor v1.5 changes:

Now shows attachment size. Can now be used to convert PNG to JPG without any other changes to the image.

Attachment editor v1.4 changes:

Updated abstracted file system code.

Attachment editor v1.3 changes:

Fixed issue with int precision loss.

Attachment editor v1.2 changes:

Fixed link in conversation template.

Attachment editor v1.1 changes:

Fixed issue with Add border function.