Frame tool is hard to work with
Hi! I found some problems with frame.
## Problem 1: Frame would not contain any existing shapes until you move those shapes one time.
### Steps to reproduce:
1. add a box
2. add a frame
3. move the frame

### Expected behavior:
The box should be move with frame.

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## Problem 2: Frame prevents you from box-selecting shapes inside frame.
### Steps to reproduce:
1. add a frame
2. add two box in the frame
3. try to box-select the boxes by start dragging in the frame

### Expected behavior 
Box-selecting in the frame.
(I noticed Excalidraw doesn't move the frame until you select it)