Add support for height argument to figure shortcode

Fixes #4014

Author: kaushalmodi

docs/content/content-management/shortcodes.md

@@ -88,6 +88,7 @@ The `figure` shortcode can use the following named parameters:
 * `attr` (i.e., attribution)
 * `attrlink`
 * `alt`
+* `height`
 
 #### Example `figure` Input
 

hugolib/shortcode_test.go

@@ -299,6 +299,16 @@ func TestFigureImgWidth(t *testing.T) {
 	CheckShortCodeMatch(t, `{{% figure src="/found/here" class="bananas orange" alt="apple" width="100px" %}}`, "\n<figure class=\"bananas orange\">\n    \n        <img src=\"/found/here\" alt=\"apple\" width=\"100px\" />\n    \n    \n</figure>\n", nil)
 }
 
+func TestFigureImgHeight(t *testing.T) {
+	t.Parallel()
+	CheckShortCodeMatch(t, `{{% figure src="/found/here" class="bananas orange" alt="apple" height="100px" %}}`, "\n<figure class=\"bananas orange\">\n    \n        <img src=\"/found/here\" alt=\"apple\" height=\"100px\" />\n    \n    \n</figure>\n", nil)
+}
+
+func TestFigureImgWidthAndHeight(t *testing.T) {
+	t.Parallel()
+	CheckShortCodeMatch(t, `{{% figure src="/found/here" class="bananas orange" alt="apple" width="50" height="100" %}}`, "\n<figure class=\"bananas orange\">\n    \n        <img src=\"/found/here\" alt=\"apple\" width=\"50\" height=\"100\" />\n    \n    \n</figure>\n", nil)
+}
+
 const testScPlaceholderRegexp = "HAHAHUGOSHORTCODE-\\d+HBHB"
 
 func TestExtractShortcodes(t *testing.T) {

tpl/tplimpl/template_embedded.go

@@ -21,7 +21,7 @@ func (t *templateHandler) embedShortcodes() {
 	t.addInternalShortcode("figure.html", `<!-- image -->
 <figure {{ with .Get "class" }}class="{{.}}"{{ end }}>
     {{ with .Get "link"}}<a href="{{.}}">{{ end }}
-        <img src="{{ .Get "src" }}" {{ if or (.Get "alt") (.Get "caption") }}alt="{{ with .Get "alt"}}{{.}}{{else}}{{ .Get "caption" }}{{ end }}" {{ end }}{{ with .Get "width" }}width="{{.}}" {{ end }}/>
+        <img src="{{ .Get "src" }}" {{ if or (.Get "alt") (.Get "caption") }}alt="{{ with .Get "alt"}}{{.}}{{else}}{{ .Get "caption" }}{{ end }}" {{ end }}{{ with .Get "width" }}width="{{.}}" {{ end }}{{ with .Get "height" }}height="{{.}}" {{ end }}/>
     {{ if .Get "link"}}</a>{{ end }}
     {{ if or (or (.Get "title") (.Get "caption")) (.Get "attr")}}
     <figcaption>{{ if isset .Params "title" }}