GPX viewer 2.4

GPX viewer v2.4 changes:

Fixed issue with file_hash and file_key fields.

GPX viewer v2.3 changes:

Improved handling of GPX files.

GPX viewer v2.2 changes:

Now compatible with PHP 8.

GPX viewer v2.1 changes:

Now works with XF 2.2 and newer.

GPX viewer v2.0 changes:

Now compatible with PHP 7.4.

GPX viewer v1.9 changes:

Fixed issue where empty variable caused server error.

GPX viewer v1.8 changes:

Added code to prevent malformed GPX attachment data from causing server error.

GPX Viewer v1.7 changes:

Added code to prevent server error log if attachment is not found.

GPX viewer v1.6 changes:

Now able use GPX viewer button in preview.

GPX viewer v1.5 changes:

Now works with PHP 7.2.