Note: this function should probably be added to Phobos eventually.

We were using the default template parameter, `char`,
and as the documentation for `get` states:
> If asking for char, content will be converted from
> the connection character set (specified in HTTP
> response headers or FTP connection properties,
> both ISO-8859-1 by default) to UTF-8.

However we are downloading a binary so converting
it to UTF-8 will fail. Especially if we intend
to cast it to `ubyte[]` afterwards.

This makes the source of the issue more obvious when using
the verbose flag.

Since this is not used directly anywhere inside of dub,
make it private so it can be later refactored.

Improves library API usage and bugs with the build generator

This reverts commit db49cbe.

All usages actually want to ensure the directory is present,
and don't care about having a separation between existence check
and creation.

It doesn't make sense to have those in two separate modules.

This removes the range API and instead uses Appender,
while using a limited and centralized set of functions
to read/write from files.
The end goal is to permit dependency injection,
which is a pre-requisite to extending the test-suite.

library-nonet has been broken for years, and is not used.
Most importantly, it has no support for timeout.
Lastly, the likely reason it was originally introduced was to
avoid a hard dependency on cURL, something that has been fixed
in Phobos directly.

This will provide a vastly superior UX to the users:
- They will be warned about typos;
- The type information provided will be more accurate and always include file/line infos
  (e.g. no more 'Invalid SemVer versions');
- We can expose a better recipe struct to library users on the long run,
  by separating the actual data DUB uses from what it reads;
- We can be more descriptive about errors / intent, for example by using `SetInfo`;

The new module replaces dub.internal.vibecompat.core.log by using the
same function names, but implementing colored output and the left
fixed-width tag. Overloaded functions are provided to output colored
text.

Still missing initLogging() and non-TTY stdout/stderr detection

Fix issue #1775: preBuildCommand does not take root into account
merged-on-behalf-of: Nicholas Wilson <thewilsonator@users.noreply.github.com>