Enable multiline by default and update submodules

• Enable the "one element per line" option by default
 • Update formspec_ast and fs51
 • Export formspecs with formspec_version 5

formspec_ast

@@ -1 +1 @@
-Subproject commit 8b18059cdf701d8942ec5e0602b60726b2a9d869
+Subproject commit 1d92fcf28b1bb136abdd04cd2582a4c4d25f0c24

fs51

@@ -1 +1 @@
-Subproject commit 382fd4cc311a99898ee1d7f74765ecbf8d322a28
+Subproject commit 329056cbea8c65e5bce00337cbe4ab4944335149

index.lua

@@ -456,7 +456,7 @@ local function render_into(base, formspec, callbacks)
 end
 
 local element_dialog
-local load_save_opts = {}
+local load_save_opts = {multiline = true}
 local function show_load_save_dialog()
     local callbacks = {}
     local formspec = [[

renderer.lua

@@ -379,7 +379,7 @@ function renderer.elem_to_ast(elem)
     local w = tonumber(elem:getAttribute('data-w'))
     local h = tonumber(elem:getAttribute('data-h'))
     local res = {
-        formspec_version = 4,
+        formspec_version = 5,
         {
             type = 'size',
             w = w or 0,