Fix issues from Inheritance spec (#36)

* Separate inheritance block and expansion

* Catch top level partial definition, and block newlines

* Add testTrailingNewLines to verify output of trailing newlines in partials

* Remove comment

* If block,partial has indentation add indent for first line

* Re-enable full sections spec

* withBlockExpansion

* Get indentation of blocks correct

Sources/Mustache/Template.swift

@@ -38,7 +38,8 @@ public struct MustacheTemplate: Sendable {
         case unescapedVariable(name: String, transforms: [String] = [])
         case section(name: String, transforms: [String] = [], template: MustacheTemplate)
         case invertedSection(name: String, transforms: [String] = [], template: MustacheTemplate)
-        case inheritedSection(name: String, template: MustacheTemplate)
+        case blockDefinition(name: String, template: MustacheTemplate)
+        case blockExpansion(name: String, default: MustacheTemplate, indentation: String?)
         case partial(String, indentation: String?, inherits: [String: MustacheTemplate]?)
         case contentType(MustacheContentType)
     }