Optimize reconfiguration script to require fewer resources

[zuphilip]

Currently, the reconfiguration script configure.sh needs a lot of time and resources (up to 5 GB RAM) see https://github.com/citation-style-language/csl-editor/wiki/Getting-Started#reconfiguring . Generating all examples for all styles (which one might have updated) takes it times and allocate a lot of memory. Because all these examples will be written in a single file, there seems to be no (easy) way to do a more incremental update. However, the memory allocation problem should be solvable. We should check that we close early all files which are not anymore needed. Moreover, @kba suggested that also writing to the output file intermediate and then just append to this file might help as well.

(I don't work on this issue at the moment.)

[adam3smith]

yeah, this is one of the first things that should happen if someone puts serious work into this. The status quo is ridiculous