Add initial implementation of Dialogue Manager; include core scripts, scenes, and resources

addons/dialogue_manager/compiler/compiler_result.gd

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+## The result of using the [DMCompiler] to compile some dialogue.
+class_name DMCompilerResult extends RefCounted
+
+
+## Any paths that were imported into the compiled dialogue file.
+var imported_paths: PackedStringArray = []
+
+## Any "using" directives.
+var using_states: PackedStringArray = []
+
+## All titles in the file and the line they point to.
+var titles: Dictionary = {}
+
+## The first title in the file.
+var first_title: String = ""
+
+## All character names.
+var character_names: PackedStringArray = []
+
+## Any compilation errors.
+var errors: Array[Dictionary] = []
+
+## A map of all compiled lines.
+var lines: Dictionary = {}
+
+## The raw dialogue text.
+var raw_text: String = ""