Add configurable Altmetric badge type via show_altmetric_type parameter

[epikentros]

Summary

This PR adds a new shortcode parameter show_altmetric_type to all publication list shortcodes (tplist, tpcloud, tpsearch), allowing users to choose which Altmetric badge type to display instead of being
limited to a hardcoded type.

Problem

The Altmetric embed API supports multiple badge types (donut, medium-donut, large-donut, bar, medium-bar, large-bar, 1, 4), as documented at https://badge-docs.altmetric.com/customizations.html#badge-types

Previously, teachPress had the badge type hardcoded (large-donut and medium-donut), with no way to change it without modifying the plugin core directly.

Changes

core/publications/templates.php

• prepare_altmetric(): added $altm_type parameter with default value 'large-donut' for backward compatibility; applied esc_attr() to both $doi and $altm_type for consistency with WordPress coding
  standards; removed unused $doi_url variable (dead code)
• get_infocontainer(): badge type now resolved from show_altmetric_type setting, with fallback to 'large-donut' when not set
• get_images(): same badge type logic applied to the donut/image-area rendering path; removed unused $altmetric_type variable

core/shortcodes.php

• show_altmetric_type parameter added to all shortcode definitions (tp_publist_shortcode, tp_cloud_shortcode, tp_list_shortcode, tp_search_shortcode)
• Parameter sanitised with sanitize_key(), appropriate for the accepted values (lowercase strings and hyphens)
• Docblock updated to document the new parameter; fixed a pre-existing typo show_altmetric_entrx → show_altmetric_entry
• Removed an incorrect $count++ block that referenced a non-existent show_dimensions_type setting, which was incorrectly inflating the colspan calculation

Backward Compatibility

Fully backward compatible. When show_altmetric_type is not set, behaviour is identical to the previous version.

Usage example

[tplist show_altmetric_entry="1" show_altmetric_type="large-donut"]
[tplist show_altmetric_donut="1" show_altmetric_type="medium-donut"]