Feature/modularize editor

[maxme]

This is a huge PR, because I had to extract WordPressAnalytics and WorPressEditor in their own repo / subtree. The idea behind this modularization is to have a Fragment with a title + content editor. It also includes a format bar and a settings button because we don't want to have nested Fragments.

I also made some changes in WordPressUtils (moved some code from the main project + renaming). That was a bad idea to include it in that PR, but it was also too late to change it back.

Everything media related (upload, gallery creation, etc.) now lives in the EditPostActivity and could be reused for both the legacy and visual editor.

The legacy editor supports wysiwyg edition for local drafts and html edition only for published posts/pages, so we have a dirty interface: here and here for instance, we will remove that when the legacy editor can be removed completly (or if we want to improve it and make some sort of html2spanned converter that would allow the wysiwyg edition of published posts).

The visual editor is not usable yet, but everything is ready to make it work (lives in EditorFragment).

There is also a sample project that can be run without the main project. It should help to work on the hybrid editor and write new tests.

Warning: once this PR is merged, we must push WordPressUtils in its subtree (same for WordPressAnalytics and WordPressEditor, but this is not as important).

Tested with:

• QuickPress: OK
• QuickPhoto: OK
• New gallery from the media picker: OK
• New gallery / post from the media library: OK
• New post with a single picture from the media picker: OK
• New post with several pictures from the media picker: OK
• Share with WordPress with a single picture: OK
• Share with WordPress with several pictures: OK

[tonyr59h]

The gallery icon is not visible in the editor. It works as expected, just impossible to tell that it's been added to the post (unless you highlight it). See here.

Edit: This is the current one. Should we import it to the editor module?

[tonyr59h]

Tested all the scenarios you mentioned, on both a tablet and phone, and they're all working 👍

Gonna dig through the projects a bit now.

[maxme]

The gallery icon is not visible in the editor. It works as expected, just impossible to tell that it's been added to the post (unless you highlight it). See here.

Edit: This is the current one. Should we import it to the editor module?

Yep, moved the icon to the editor module and updated the constructor call in a5e6c39

[maxme]

Example project should look like this:
https://cloudup.com/cNWo0fVB2r8

[tonyr59h]

Tested all the features both online and offline in the app as well as the example project and things seem to be working smoothly.

👍 for the interfaces and setting up the WebView.

Reading through this I saw we can also override navigations. Maybe we could redirect WordPress.com sites to the app.

I'm onboard with the merge. Do we want to wait on @bummytime to chime in before we push the button.

[bummytime]

@tonyr59h @maxme: I have been working with @aforcier for the past few days on a private copy of this branch and we have not encountered any issues. Since our focus was mainly porting portions of the iOS-Editor code over to Android, we did not test everything as well as @tonyr59h. However in our use case this PR provides a great starting point for the updated editor.

So from our perspective, it's a