Convert image all 5.3

Convert image all v5.3 changes:

Attachment tables xf_attachment and xf_attachment_data are now updated more accurately to reflect original post date and post user id.

Convert image all v5.2 changes:

Fixed issue when multiple IMG tags were on the same line.

Convert image all v5.1 changes:

Now supports $config['http']['proxy'] function.

Convert image all v5.0 changes:

Now retains IMG bbcode options.

Convert image all v4.9 changes:

Now supports alt text in the IMG bb_code. Now excludes posts and threads which are not visible.

Convert image all v4.8 changes:

Now support hot linked images using Alt text in IMG tag.

Convert image all v4.7 changes:

Fixed issue with dead link causing server error log.

Convert image all v4.6 changes:

Removed function which converted Proxy images.

Convert image all v4.4 changes:

Will now convert XenForo Image proxy to attachments.

Convert image all v4.5 changes:

Fixed issue with temporary file.

Convert image all v4.3 changes:

Added Show results to options page.