use absolute path for metadata

This is possible since we bundled nativefs and started using LÖVE's
Physfs.

0119-load_metadata

@@ -1,10 +1,14 @@
 load_metadata = function(filename)
 	local mfile = metadata_file(filename)
-	local mpath = save_dir_path(mfile)
-	if not love.filesystem.getInfo(mpath) then
+	local mpath = full_path(mfile)
+	if not nativefs.getInfo(mpath) then
 		-- comments will always have metadata,
 		-- so we only get here for top-level posts with no parent
 		return {replies={}}
 	end
-	return json.decode(love.filesystem.read(mpath))
-end
+	local contents, err = App.read_file(mpath)
+	if not contents then
+		error(err)
+	end
+	return json.decode(contents)
+end

0121-full_path

@@ -1,3 +1,3 @@
 full_path = function(id)
-	return  love.filesystem.getSaveDirectory()..'/'..Data_dir..'/'..id
-end
+	return App.save_dir..Data_dir..'/'..id
+end

0123-save_dir_path

@@ -1,3 +0,0 @@
-save_dir_path = function(id)
-	return Data_dir..'/'..id
-end

0145-save_metadata

@@ -3,9 +3,13 @@ save_metadata = function(node)
 	local mfile = metadata_file(node.id)
 	local mpath
 	if node.metadata.parent then
-		mpath = save_dir_path('comments/'..mfile)
+		mpath = full_path('comments/'..mfile)
 	else
-		mpath = save_dir_path(mfile)
+		mpath = full_path(mfile)
 	end
-	love.filesystem.write(mpath, json.encode(node.metadata))
-end
+	print('saving metadata for', node.id, 'to', mpath)
+	local status, err = App.write_file(mpath, json.encode(node.metadata))
+	if err then
+		error(err)
+	end
+end

default_map

@@ -245,12 +245,6 @@
         "w": 600,
         "h": 520,
     },
-    "save_dir_path": {
-        "x": 1904.7154211416,
-        "y": 5161.1643669644,
-        "w": 600,
-        "h": 78,
-    },
     "Reply_button_border_color": {
         "x": 1861.3857767887,
         "y": -294.16322368905,