chore: Move to Typescript (#2783)

This PR moves the entire project to Typescript. Due to the ~1000 ignores this will lead to a messy codebase for a while, but the churn is worth it – all of those ignore comments are places that were never type-safe previously.

closes #1282

server/migrations/20180819054252-disable-sharing.js

@@ -1,12 +1,12 @@
 module.exports = {
   up: async (queryInterface, Sequelize) => {
-    await queryInterface.addColumn('teams', 'sharing', {
+    await queryInterface.addColumn("teams", "sharing", {
       type: Sequelize.BOOLEAN,
       allowNull: false,
-      defaultValue: true
+      defaultValue: true,
     });
   },
   down: async (queryInterface, Sequelize) => {
-    await queryInterface.removeColumn('teams', 'sharing');
-  }
-}
+    await queryInterface.removeColumn("teams", "sharing");
+  },
+};