Project tree view and creation (#203)

* Implement creating and importing new projects

* Add downloading a zip of a project

* Project validation (WIP)

* Add project side panel, remove project pages

* Project file saving

* Add file tree actions to rename and delete

* Fix file creation auto focus

* Add button to save file from menu

* Add project creation

* Fix specificity on version switcher button

* Update default version to 1.19

* List project files by type, remember project and delete project

src/config.json

@@ -125,6 +125,11 @@
       "schema": "chat_type",
       "minVersion": "1.19"
     },
+    {
+      "id": "pack_mcmeta",
+      "url": "pack-mcmeta",
+      "schema": "pack_mcmeta"
+    },
     {
       "id": "dimension",
       "url": "dimension",