2)  Improve table-rendering to more resilient against slight vertical offsets

Improve Table-Rendering "better adjust to grid" and "avoid faulty table layouts"

• Current Table-rendering in some cases (rowspanned cells, cells with different baselines or cells with dramatically different font-sizes) is not capable of fixing slightly overlapping elements properly leading to disappearing lines. The overlap may happens because of very big font-sizes which have a big whitespace after (so no visible overlap)
• Also the current algorithm of calculating rowspans fails in situations, where a cell starts AND ends "in the middle" of other rows. Faulty table-layouts/rowspans often lead to ugly rendereing-problems ("exploded" tables)

New Algorithm:

• Scanning the table top to bottom before rendering
• Insert rowspans for the other elements "touching the line" whenever an element starts or ends "in the middle" of other elements (not on-line)
• Add checks to slightly reposition elements to the left/right/top/bottom in case they overlap their predecessor or left/right neighbour. The relocation can be achieved using the "Collision-Map" from feature https://jira.translate5.net/browse/TRANSLATE-4106
• in case elements can not be repositioned add negative margins and shrink the element to fit: This leads to visible overlaps in the frontend but keeps the overall layout

Screens: see https://confluence.translate5.net/spaces/MI/pages/689602561/Visual+Enhancemets+IV