FunctionManager: create new()

src/function_manager.rs

@@ -17,9 +17,7 @@ pub struct FunctionManager {
 
 impl Default for FunctionManager {
     fn default() -> Self {
-        let mut d = Self {
-            functions: Vec::new()
-        };
+        let mut d = Self::new();
         d.push_empty();
         d
     }
@@ -46,6 +44,12 @@ fn button_area_button<'a>(text: impl Into<WidgetText>) -> Button<'a> {
 }
 
 impl FunctionManager {
+    pub fn new() -> Self {
+        Self {
+            functions: Vec::new()
+        }
+    }
+
     #[inline]
     fn get_hash(&self) -> u64 {
         let mut hasher = DefaultHasher::new();