Remove load_plugin hook - closes #1073

Refs #1042

This reverts commit 81dea4b07a.

tests/fixtures.py

@@ -43,7 +43,6 @@ EXPECTED_PLUGINS = [
             "extra_js_urls",
             "extra_template_vars",
             "forbidden",
-            "load_template",
             "menu_links",
             "permission_allowed",
             "prepare_connection",

tests/plugins/my_plugin.py

@@ -308,9 +308,3 @@ def table_actions(datasette, database, table, actor):
             },
             {"href": datasette.urls.instance(), "label": "Table: {}".format(table)},
         ]
-
-
-@hookimpl
-def load_template(template, request):
-    if template == "show_json.html" and request.args.get("_special"):
-        return "<h1>Special show_json: {{ filename }}</h1>"

tests/test_plugins.py

@@ -801,8 +801,3 @@ def test_hook_table_actions(app_client):
         {"label": "Database: fixtures", "href": "/"},
         {"label": "Table: facetable", "href": "/"},
     ]
-
-
-def test_hook_load_template(app_client):
-    response = app_client.get("/-/databases?_special=1")
-    assert response.text == "<h1>Special show_json: databases.json</h1>"