Update menu items of evernote plugin

[Hzj-jie]

• KOReader version: Up to bump base for android build fix #2775
• Device: Independent

Issue

The menu items of evernote plugin are confusing; we would be better to update it.

A potential solution is,

Login
Export nodes from all books
Export nodes from this book (Unclickable in FileManager)
Export to --- (Unclickable)
  >> Evernote
  >> HTML
  >> Text

Steps to reproduce

[houqp]

I think this would be better served with a pop up dialog. Then you can have the following UI setup:

From:
[x] export notes from all books
[ ] export ntoes from this book (hide or uncheckable in file browser)

To:
[button: Evernote] [button: HTML] [button: Text]

[Frenzie]

I'm not sure if this is still relevant, pinging @Galunid.

[Galunid]

Sure, I can do that, although is there a point? And if so, which one should be implemented, the OP's one, or houqp's one? Personally I like it how it is, but it shouldn't be a big deal to change it.

[Frenzie]

There's one thing that hadn't been implemented in 2017, the separator. I'll stick some in.

I understand what's being called confusing here. You can't click export until you select one of those checkmarks.

I think houqp's suggestion is better but personally I have no interest in implementing/testing it.