(core) Form kanban tasks

Summary:
- Open all links in a new tab
- Excluding not filled columns (to fix trigger formulas)
- Fixed Ref/RefList submission
- Removing redundant type definitions for Box
- Adding header menu item
- Default empty values in select control

Test Plan: Updated

Reviewers: georgegevoian

Reviewed By: georgegevoian

Differential Revision: https://phab.getgrist.com/D4166

app/client/ui2018/IconList.ts

@@ -79,6 +79,7 @@ export type IconName = "ChartArea" |
   "FunctionResult" |
   "GreenArrow" |
   "Grow" |
+  "Headband" |
   "Heart" |
   "Help" |
   "Home" |
@@ -234,6 +235,7 @@ export const IconList: IconName[] = ["ChartArea",
   "FunctionResult",
   "GreenArrow",
   "Grow",
+  "Headband",
   "Heart",
   "Help",
   "Home",