Summary:
Adding signature support in preferences
Extracting out DraftStore extensions from the Contenteditable component
Moved Contenteditable to the nylas component kit
Build react remote window selection synchronization.
Test Plan: todo
Reviewers: bengotow
Reviewed By: bengotow
Differential Revision: https://phab.nylas.com/D2204
Summary:
- Draft Store extensions can now implement `prepareNewDraft` to have an opportunity to change a draft before it's displayed for the first time.
- When composers are torn down, they delete their draft if it is still pristine. This makes the behavior of closing unedited popout drafts the same as leaving unedited inline drafts.
- The DraftStoreProxy keeps the initial body of the draft *if* it started in a pristine state. This means "is the body empty" is just a simple == check, and it takes into account anything added to the body by extensions.
- Calling Actions.destroyDraft doesn't blow up anymore if the draft session can't be found. This was a bug and meant that you couldn't destroy drafts which hadn't been previously edited, and also meant that bad things(tm) happened when you called destroyDraft twice, which seemed like overkill.
- DestroyDraft task now exits gracefully when the draft cannot be found.
You can test this feature by adding the following to your config.cson:
```
signatures:
NAMESPACEID: "<br/><br/><div id=\"Signature\"><div id=\"divtagdefaultwrapper\" style=\"font-size:12pt; color:#000000; background-color:#FFFFFF; font-family:Calibri,Arial,Helvetica,sans-serif\"><p></p><table border=\"0\" cellpadding=\"0\" cellspacing=\"0\" width=\"450\" style=\"font-family:'Times New Roman'; table-layout:fixed\"><tbody><tr><td class=\"logo-td\" align=\"left\" valign=\"top\" width=\"76\"><p style=\"margin-bottom:10px; margin-right:10px; font-family:Helvetica,Arial,sans-serif; font-size:14px; line-height:16px\"><a href=\"http://www.nylas.com/\" class=\"clink logo-container\" style=\"text-decoration:none\"><img alt=\"Nylas\" border=\"0\" class=\"sig-logo\" height=\"80\" width=\"66\" style=\"-webkit-user-select: none;\" src=\"https://s3-us-west-2.amazonaws.com/nylas-static-assets/nylas-email-signature.png\"></a></p><p class=\"social-list\" style=\"font-size:0px; line-height:0; font-family:Helvetica,Arial,sans-serif\"></p></td><td align=\"left\" valign=\"top\" nowrap=\"nowrap\" class=\"spacer-td\" width=\"16\" style=\"border-left-width:2px; border-left-style:solid; border-left-color:rgb(30,162,162)\"><img width=\"10\" style=\"-webkit-user-select: none;\" src=\"https://s3.amazonaws.com/htmlsig-assets/spacer.gif\"></td><td align=\"left\" valign=\"top\" nowrap=\"nowrap\" class=\"content-td\" width=\"368\"><div class=\"content-pad\"><p style=\"font-family:Helvetica,Arial,sans-serif; font-size:14px; line-height:16px; color:rgb(33,33,33); margin-bottom:10px\"><span class=\"txt signature_name-target sig-hide\" style=\"font-weight:bold; display:inline\">Gleb Polyakov</span> <span class=\"email-sep break\" style=\"display:inline\"><br></span><a class=\"link email signature_email-target sig-hide\" href=\"mailto:gleb@nylas.com\" style=\"color:rgb(30,162,162); text-decoration:none; display:inline\">gleb@nylas.com</a><span class=\"signature_email-sep sep\" style=\"display:inline\"> / </span><span class=\"txt signature_mobilephone-target sig-hide\" style=\"display:inline\">404-786-4100</span></p><p style=\"font-family:Helvetica,Arial,sans-serif; font-size:14px; line-height:16px; margin-bottom:10px\"><span class=\"txt signature_companyname-target sig-hide\" style=\"font-weight:bold; color:rgb(33,33,33); display:inline\">Nylas</span> <span class=\"company-sep break\" style=\"display:inline\"><br></span><span class=\"address-sep break\"></span><span class=\"address2-sep break\"></span><span class=\"website-sep break\"></span><a class=\"link signature_website-target sig-hide\" href=\"http://www.nylas.com/\" style=\"color:rgb(30,162,162); text-decoration:none; display:inline\">http://www.nylas.com</a></p></div></td></tr><tr><td colspan=\"3\"></td></tr><tr><td colspan=\"3\"></td></tr><tr><td colspan=\"3\"><p class=\"txt signature_disclaimer-target\" style=\"font-family:Helvetica,Arial,sans-serif; color:rgb(33,33,33); font-size:9px; line-height:12px; margin-top:10px\"></p></td></tr></tbody></table><p></p></div></div>"
```
specs for draft store extension hooks, some draft store refactoring
Test Plan: Run a few new specs that make sure extensions are run
Reviewers: evan
Reviewed By: evan
Differential Revision: https://phab.nylas.com/D1741
