Proposal - Move build.cmd/clean cmd file to tools sub-folder

[bovirus]

Hello.

I have a prossoal about a moving of some files of main folder.

build.cmd and clean.cmd can be moved under tools sub-older (of course you have to modify bild.cmd/clean.cmd to reflect the new location) to have all commands unddr tools sub-folder.

What do you think about it?

I pushed this morining the PR.

I added also some checks about file/folfers exist

[mswhirl]

Done. Thank you.