fix: Row Detail should also work with fixed grid height or w/o autoHeight

[ghiscoding]

• defining a fixed grid height and/or disabling resizer.autoHeight should expect the Row Detail to still work properly (it wasn't before this PR)
  • the resizer.autoHeight had a side effect of calling row invalidate after the resize and this side effect was in fact hiding the UI problems described above, which meant that in a few occasions, the Row Details weren't invalidated/redrawn properly
• also rewrite the pre/post templates to use native HTML code instead of HTML string, which is better for perf and also more secure without requiring any sanitization

[stackblitz]

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