Add Hugo Piper with SCSS support and much more

Before this commit, you would have to use page bundles to do image processing etc. in Hugo.

This commit adds

* A new `/assets` top-level project or theme dir (configurable via `assetDir`)
* A new template func, `resources.Get` which can be used to "get a resource" that can be further processed.

This means that you can now do this in your templates (or shortcodes):

```bash
{{ $sunset := (resources.Get "images/sunset.jpg").Fill "300x200" }}
```

This also adds a new `extended` build tag that enables powerful SCSS/SASS support with source maps. To compile this from source, you will also need a C compiler installed:

```
HUGO_BUILD_TAGS=extended mage install
```

Note that you can use output of the SCSS processing later in a non-SCSSS-enabled Hugo.

The `SCSS` processor is a _Resource transformation step_ and it can be chained with the many others in a pipeline:

```bash
{{ $css := resources.Get "styles.scss" | resources.ToCSS | resources.PostCSS | resources.Minify | resources.Fingerprint }}
<link rel="stylesheet" href="{{ $styles.RelPermalink }}" integrity="{{ $styles.Data.Digest }}" media="screen">
```

The transformation funcs above have aliases, so it can be shortened to:

```bash
{{ $css := resources.Get "styles.scss" | toCSS | postCSS | minify | fingerprint }}
<link rel="stylesheet" href="{{ $styles.RelPermalink }}" integrity="{{ $styles.Data.Digest }}" media="screen">
```

A quick tip would be to avoid the fingerprinting part, and possibly also the not-superfast `postCSS` when you're doing development, as it allows Hugo to be smarter about the rebuilding.

Documentation will follow, but have a look at the demo repo in https://github.com/bep/hugo-sass-test

New functions to create `Resource` objects:

* `resources.Get` (see above)
* `resources.FromString`: Create a Resource from a string.

New `Resource` transformation funcs:

* `resources.ToCSS`: Compile `SCSS` or `SASS` into `CSS`.
* `resources.PostCSS`: Process your CSS with PostCSS. Config file support (project or theme or passed as an option).
* `resources.Minify`: Currently supports `css`, `js`, `json`, `html`, `svg`, `xml`.
* `resources.Fingerprint`: Creates a fingerprinted version of the given Resource with Subresource Integrity..
* `resources.Concat`: Concatenates a list of Resource objects. Think of this as a poor man's bundler.
* `resources.ExecuteAsTemplate`: Parses and executes the given Resource and data context (e.g. .Site) as a Go template.

Fixes #4381
Fixes #4903
Fixes #4858

tpl/tplimpl/template_funcs_test.go

@@ -51,6 +51,9 @@ func newTestConfig() config.Provider {
 	v.Set("i18nDir", "i18n")
 	v.Set("layoutDir", "layouts")
 	v.Set("archetypeDir", "archetypes")
+	v.Set("assetDir", "assets")
+	v.Set("resourceDir", "resources")
+	v.Set("publishDir", "public")
 	return v
 }
 
@@ -76,12 +79,13 @@ func TestTemplateFuncsExamples(t *testing.T) {
 	v.Set("workingDir", workingDir)
 	v.Set("multilingual", true)
 	v.Set("contentDir", "content")
+	v.Set("assetDir", "assets")
 	v.Set("baseURL", "http://mysite.com/hugo/")
 	v.Set("CurrentContentLanguage", langs.NewLanguage("en", v))
 
 	fs := hugofs.NewMem(v)
 
-	afero.WriteFile(fs.Source, filepath.Join(workingDir, "README.txt"), []byte("Hugo Rocks!"), 0755)
+	afero.WriteFile(fs.Source, filepath.Join(workingDir, "files", "README.txt"), []byte("Hugo Rocks!"), 0755)
 
 	depsCfg := newDepsConfig(v)
 	depsCfg.Fs = fs
@@ -113,7 +117,8 @@ func TestTemplateFuncsExamples(t *testing.T) {
 				require.NoError(t, d.LoadResources())
 
 				var b bytes.Buffer
-				require.NoError(t, d.Tmpl.Lookup("test").Execute(&b, &data))
+				templ, _ := d.Tmpl.Lookup("test")
+				require.NoError(t, templ.Execute(&b, &data))
 				if b.String() != expected {
 					t.Fatalf("%s[%d]: got %q expected %q", ns.Name, i, b.String(), expected)
 				}