`nimble (install|build) --skipdeps` to install|build but skipping checking dependencies
when developping a project, after a successful `nimble install` or `nimble build` it's wasteful to keep checking all dependencies (especially when there are a lot); a flag

`nimble install --skipdeps` 
`nimble build --skipdeps` 

would just do the install part, skipping the `Verifying dependencies for foo@ver` part