[MIG] report_label

[IMP] allow to create report.paperformat.label without creating each time report.paperformat item
[FIX] Remove useless data that are specific Label: Agipa 114016
[REF] simplify UI, removing custom entry for ir.actions.server
[ADD] migration script to migrate name field
[IMP] Add label_background_color to allow to easily define background-color for label. (That can be usefull to debug label positions)
[DOC] update screenshots to new V16 versions
[IMP] Set body and html margin to 0 to to able to be predictive when designing a label sheet
[IMP] replace style by class in the label template, reducing the size of the html code generated.
[IMP] replace label_template by label_template_view_id on the ir.actions.server model, removing useless xml and python code. (provide migration scripts)
[REF] Split wizard file into wizard and wizard line file, following OCA guidelines

report_label/migrations/16.0.1.0.0/pre-migration.py

@@ -0,0 +1,40 @@
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from openupgradelib import openupgrade
+
+from odoo.tools.sql import column_exists
+
+
+@openupgrade.migrate()
+def migrate(env, version):
+    if not column_exists(env.cr, "base_comment_template", "models"):
+        openupgrade.logged_query(
+            env.cr,
+            "ALTER TABLE report_paperformat_label ADD COLUMN name char",
+        )
+        openupgrade.logged_query(
+            env.cr,
+            """
+            UPDATE report_paperformat_label rpfl
+            SET name = rpf.name
+            FROM report_paperformat rpf
+            WHERE rpfl.name is null
+            AND rpfl.paperformat_id = rpf.id;
+            """,
+        )
+
+    if not column_exists(env.cr, "ir_act_server", "label_template_view_id"):
+        openupgrade.logged_query(
+            env.cr,
+            "ALTER TABLE ir_act_server ADD COLUMN label_template_view_id integer;",
+        )
+        openupgrade.logged_query(
+            env.cr,
+            """
+            UPDATE ir_act_server ias
+            SET label_template_view_id = iuv.id
+            FROM ir_ui_view iuv
+            WHERE ias.label_template is not null
+            AND iuv.key = ias.label_template;
+            """,
+        )