Implement deleteRow and insertRow for <table> element
Continued from #6936
Source-Repo: https://github.com/servo/servo
Source-Revision: 292dbfe809ddf048065f790071ea2022406536d7
'thead' and 'tfoot' now create instances of HTMLTableSectionElement
HTMLTableSectionElement.rows has been implemented
Source-Repo: https://github.com/servo/servo
Source-Revision: 9eb0effaf674da0f24eb5e0ae8e290c9648598de
Extracted this out of #5649
This commit was created with the following commands:
```
find . -iname "*.webidl" -type f -print0 | xargs -0 sed -i '' 's/http:\(.*\)whatwg.org/https:\1whatwg.org/g'
```
```
find . -iname "*.rs" -type f -print0 | xargs -0 sed -i '' 's/http:\(.*\)whatwg.org/https:\1whatwg.org/g'
```
Source-Repo: https://github.com/servo/servo
Source-Revision: 4997d3a112354a407365fede1ab1944834a2e13c
