Normalize line endings and export-ignore
Normalize line endings and export-ignore

Ensure to normalize line endings to Unix (LF) and exclude some extra
files which are uncessary to the extension itself when exporting an
archive.

pladask/flarum-ext-norwegian-nynorsk,raweba/flarum-ext-danish,gtugablue/flarum-ext-portuguese,FlarumChina/flarum-ext-simplified-chinese-pro,ogioncz/flarum-ext-czech,pladask/flarum-ext-norwegian-nynorsk,pladask/flarum-ext-norwegian-bokmal,balkanje/flarum-ext-bosnian1,pladask/flarum-ext-norwegian-bokmal,ogioncz/flarum-ext-czech,FlarumChina/flarum-ext-simplified-chinese-pro,flarum/flarum-ext-english,flarum/english