Summary of Changes

Normalize some parameters in com_contact and com_content xml files (some parameters was missing in some xml, see below).
Reorder parameters as they shown in views.
Code style (https://joomla.github.io/coding-standards/?coding-standards/chapters/xml.md).

/administrator/components/com_contact/config.xml - added show_category_heading_title_text parameter, reordered parameters of category, categories, list_default_parameters fieldsets, code style.
/components/com_contact/views/categories/tmpl/default.xml - added show_category_heading_title_text, show_image_heading, initial_sort parameters, reordered parameters of basic, category, advanced fieldsets, code style.
/components/com_contact/views/category/tmpl/default.xml - added show_category_heading_title_text parameter, reordered parameters of category fieldset, code style.

/administrator/components/com_content/config.xml - fixed double names of spacers, reordered parameters of category, categories, list_default_parameters fieldsets, code style.
/components/com_content/views/categories/tmpl/default.xml - added show_category_heading_title_text, show_cat_tags, page_subheading parameters, reordered parameters of basic, category, advanced fieldsets, code style.
/components/com_content/views/category/tmpl/blog.xml - reordered parameters of category fieldset, code style.
/components/com_content/views/category/tmpl/default.xml - removed unnecessary >, reordered parameters of category fieldset, code style.

Testing Instructions

1. Use a fresh Joomla install with sample items.
2. Create a tree of some contact categories.
3. Create contacts with default options and place they to some contact categories.
4. Create menu items of the types Contacts » List All Contact Categories and Contacts » List Contacts in a Category for the root contact category.
5. Check the contact categories in the frontend. All should be fine.
6. Play with option 'Show Subcategories Text' in Global Configuration » Contacts, in the Category tab of the menu items you created and check everything is fine.

The same for content (menutypes: Articles » List All Categories, Articles » Category List, Articles » Category Blog)