add config name to .img or .iso

make all now makes build/

$(ARCH)/$

(CONFIG_NAME)_harddrive.img, where CONFIG_NAME is desktop, server, demo, etc., matching the basename of FILESYSTEM_CONFIG. ./build.sh gives options so you don't have to type make ARCH=arch CONFIG=config FILESYSTEM_CONFIG=config/arch/config.toml target ./build.sh --help for details.

make virtualbox is not tested. CONFIG_NAME is taken from FILESYSTEM_CONFIG, rather than the other way around, to allow for the case when config.toml is not in the config/ARCH directory.

Merged in f312f466 with changes minimized. I prefer to have CONFIG_NAME appended to BUILD rather than manually added in many places.

closed