Re-add new constructor functions for ComponentCompiler and CompilerConfiguration

Amends commit dc51d4ccda

As discussed in #310

api/sixtyfps-rs/sixtyfps-build/lib.rs

@@ -72,6 +72,11 @@ impl Default for CompilerConfiguration {
 }
 
 impl CompilerConfiguration {
+    /// Creates a new default configuration.
+    pub fn new() -> Self {
+        Self::default()
+    }
+
     /// Create a new configuration that includes sets the include paths used for looking up
     /// `.60` imports to the specified vector of paths.
     pub fn with_include_paths(self, include_paths: Vec<std::path::PathBuf>) -> Self {

sixtyfps_runtime/interpreter/api.rs

@@ -430,6 +430,11 @@ impl Default for ComponentCompiler {
 }
 
 impl ComponentCompiler {
+    /// Returns a new ComponentCompiler.
+    pub fn new() -> Self {
+        Self::default()
+    }
+
     /// Sets the include paths used for looking up `.60` imports to the specified vector of paths.
     pub fn set_include_paths(&mut self, include_paths: Vec<std::path::PathBuf>) {
         self.config.include_paths = include_paths;