add dialogue and cutscene system

resources/dialogue/sample_dialogues.json

@@ -0,0 +1,130 @@
+{
+  "dialogues": [
+    {
+      "id": "npc_viola_intro",
+      "displayName": "Ghost introduction",
+      "start": "start",
+      "nodes": [
+        {
+          "id": "start",
+          "type": "Line",
+          "speaker": "Ghost",
+          "portrait": "resources/w/ghost_skin001.png",
+          "text": "So, you finally reached this room.",
+          "next": "intro_choice"
+        },
+        {
+          "id": "intro_choice",
+          "type": "Choice",
+          "speaker": "Ghost",
+          "portrait": "resources/w/ghost_skin001.png",
+          "text": "Choose what Geralt says next.",
+          "choices": [
+            {
+              "id": "main_job",
+              "kind": "Main",
+              "text": "I am looking for answers.",
+              "next": "job_line"
+            },
+            {
+              "id": "optional_who",
+              "kind": "Optional",
+              "text": "Who are you?",
+              "next": "who_line",
+              "consumeOnce": true
+            },
+            {
+              "id": "exit_now",
+              "kind": "Exit",
+              "text": "Enough. Goodbye.",
+              "next": "end"
+            }
+          ]
+        },
+        {
+          "id": "who_line",
+          "type": "Line",
+          "speaker": "Ghost",
+          "portrait": "resources/w/ghost_skin001.png",
+          "text": "Only a memory. But memories can still be dangerous.",
+          "next": "intro_choice"
+        },
+        {
+          "id": "job_line",
+          "type": "Line",
+          "speaker": "Ghost",
+          "portrait": "resources/w/ghost_skin001.png",
+          "text": "Then watch carefully. What follows is not a story, but a wound.",
+          "next": "start_cutscene"
+        },
+        {
+          "id": "start_cutscene",
+          "type": "CutsceneStart",
+          "cutsceneId": "ghost_memory_01",
+          "next": "set_memory_seen"
+        },
+        {
+          "id": "set_memory_seen",
+          "type": "SetFlag",
+          "effects": [
+            {
+              "flag": "memory_seen",
+              "value": 1
+            }
+          ],
+          "next": "after_cutscene_condition"
+        },
+        {
+          "id": "after_cutscene_condition",
+          "type": "Condition",
+          "conditions": [
+            {
+              "flag": "memory_seen",
+              "op": ">=",
+              "value": 1
+            }
+          ],
+          "trueNext": "after_cutscene_line",
+          "falseNext": "end"
+        },
+        {
+          "id": "after_cutscene_line",
+          "type": "Line",
+          "speaker": "Ghost",
+          "portrait": "resources/w/ghost_skin001.png",
+          "text": "Now you know enough for the first quest hook.",
+          "next": "end"
+        },
+        {
+          "id": "end",
+          "type": "End"
+        }
+      ]
+    }
+  ],
+  "cutscenes": [
+    {
+      "id": "ghost_memory_01",
+      "background": "resources/w/room005.png",
+      "skippable": true,
+      "lines": [
+        {
+          "speaker": "Narrator",
+          "text": "The room went silent, as if the walls remembered everything.",
+          "durationMs": 2800
+        },
+        {
+          "speaker": "Ghost",
+          "portrait": "resources/w/ghost_skin001.png",
+          "text": "There were voices here once. Oaths. Smoke. Firelight.",
+          "durationMs": 2600
+        },
+        {
+          "speaker": "Narrator",
+          "text": "Now there was only ash and a story that refused to die.",
+          "durationMs": 2700
+        }
+      ]
+    }
+  ]
+}