[build] Remove build/configure scripts.
[build] Default CONFIGURATION to `debug`.
[msvc] Don't echo commands for dependency list generation.
[build] Rename `Makefile` to `Makefile.any`.

This is in preparation for `./configure`.
[build] Add `BUILD` which refers to the build output root.

This is in preparation for `./configure`.
[build] Make everything relative to `ROOT`.
[build] Add configuration script.