Add src block properties.

These are largely the same as example blocks but with a :language property.

src/types/lesser_element.rs

@@ -49,7 +49,6 @@ pub enum RetainLabels {
 #[derive(Debug)]
 pub struct ExampleBlock<'s> {
     pub source: &'s str,
-    pub name: &'s str,
     pub switches: Option<&'s str>,
     pub number_lines: Option<SwitchNumberLines>,
     pub retain_labels: RetainLabels,
@@ -69,9 +68,13 @@ pub struct ExportBlock<'s> {
 #[derive(Debug)]
 pub struct SrcBlock<'s> {
     pub source: &'s str,
-    pub name: &'s str,
     pub switches: Option<&'s str>,
-    pub contents: &'s str,
+    pub language: Option<&'s str>,
+    pub number_lines: Option<SwitchNumberLines>,
+    pub retain_labels: RetainLabels,
+    pub use_labels: bool,
+    pub label_format: Option<&'s str>,
+    pub contents: String,
 }
 
 #[derive(Debug)]