Use Git submodules instead of git clones at pull time

[ctrlcctrlv]

[Reino17]

There's a reason why https://github.com/BeRo1985/pasdblstrutils isn't "git cloned".

https://github.com/benibela/xidel/issues/83#issue-1097310089:

Of course you can also do git clone https://github.com/BeRo1985/pasdblstrutils.git, but as the testdata/parser map is a whopping 261MB(!) I figured this... curl -o components/pascal/import/pasdblstrutils/src/PasDblStrUtils.pas "https://raw.githubusercontent.com/BeRo1985/pasdblstrutils/master/src/PasDblStrUtils.pas" ...would be less "intrusive".