Speeding up importing Phobos files

[KnightMare]

> What *would* be really nice is if dmd could read .zip archives. 
> Then all you need to use a library is to download the .zip into 
> your source tree and run `dmd -i`.

or to use LZ4 for no-dependencies from zlib and smaller code:
decompressing is 50 LOC, and probably 200LOC for processing 
"directory entries" inside file. its faster by 10x than zip - 
decompressing working w/o hash-tables as LZW do.
contra: u cannot just unzip files