Fix crash when opening entity form from layer without attribute

When right-clicking in the attribute table of a layer that has
no attribute, no feature is selected. If selecting the 'Edit form'
entry, we got a crash.
Use at() instead of operator [] to avoid detach and save time
identify results: don't close dialog when last feature/layer is removed (fixes #10415)
identify result: show id as feature label if html display string is enabled (fixes #10410)
another german translation update
improve bad layer handling: make all datasource editable (fixes #7039)
Fix some failing tests
[composer] Fix scaling of symbology within composer shapes and pages (fix #10609)
Merge pull request #1457 from rouault/fix_crash_attr_table_no_attr_col

Fix crash when opening entity form from layer without attribute
Fix some failing tests (diagrams control images needed rebuilding following MTR composer changes, added tolerance to renderers test)
Do not add undo command if scale has not changed
Fix model's signals if no symbology nodes are added
Fix #10594 (crashes when removing layers)
Few fixes in the attribute table model

They were triggering assertions in debug mode...
some windows related INSTALL updates
[composer] Correct placement of cross grids (fix #10626)
[composer] Force vector rendering of shape and page symbology (fix #10616)
Follow up 7af7b88c99
[composer] Fix setting atlas filename pattern from expression dialog (fix #10628)
fix some warnings and indentation update