(core) Change 'Clear ... column' menu options to 'Reset', and make resetting columns reset type too

Summary:
The renaming is to clarify that the operation is more of a schema change, than
a data update. In particular, this is to reduce confusion why it is allowed to
anyone having Structure permission in Access Rules.

The resetting of type is a separate but related cleanup. Changing type to Any
returns the column to initial state, letting it guess type from new data, and
making it easy to enter a formula. It applies also to the "Clear and reset"
option in the Creator Panel.

Test Plan: Updated tests, added a check for type changing to Any.

Reviewers: jarek

Reviewed By: jarek

Differential Revision: https://phab.getgrist.com/D3685

test/nbrowser/MultiColumn.ts

@@ -156,11 +156,14 @@ describe('MultiColumn', function() {
       ]);
       await selectColumns('Test1', 'Test3');
       assert.equal(await columnBehavior(), 'Formula Columns');
+      await alignment('center');
+      assert.equal(await alignment(), 'center');
 
       // Reset all of them
       assert.deepEqual(await gu.availableBehaviorOptions(), ['Convert columns to data', 'Clear and reset']);
       await gu.changeBehavior('Clear and reset');
       assert.equal(await columnBehavior(), 'Empty Columns');
+      assert.equal(await alignment(), 'left');
 
       // Make them all data columns
       await gu.getCell('Test1', 1).click(); await gu.enterCell('a');