Add devtool for .baskets archive manipulation
This MR will add a tool for us to conveniently extract or create .baskets archives.
We mainly need this to revise the welcome baskets' grammar and spelling.
The verb weave seemed to be a fitting association for manipulating baskets archives.
That's why I called this tool basketweaver with the respective options --weave, and --unweave.
Though I would be open for other suggestions.
In order to build it, you need to add the option BUILD_DEVTOOLS=ON to your config.
Before merging it, i would like to ask one or two of you to test the tool as well.