[FR] Android improvements

[LucasXu0]

Description

Some requests from Google Play Android users.

• keybaord gestures
• select all
• reorder the lines
• word count of the page

Impact

• better UX

Additional Context

No response

[annieappflowy]

This is so much better than many apps like this. It is accessible offline as well so it makes it very useful for me. But there are bugs still: 1. Cannot 'select all' text. 2. Many keyboard gestures do not work, like swiping the space bar to move the cursor. 3. Cannot move the lines to rearrange them. 4. Doesn't show word count of the page. Please fix these issues and your app will be perfect.