Remove nonexistent behaviors

These were each git grepped to confirm they don't exist
Point to correct tab destroy behavior

:on-destroy-eds never existed in this git repo - seems this should
be :on-destroy-objs since that is unused
:lt.objs.eval/destroy-on-clear behavior should be destroy-on-cleared

Was introduced erroneously on 2a8513542876af9902e47b6e21a4d41295df8a20
Remove unused top-level get-skins call

Seems like a repl artificat of 0d980a12b4c5be069b0a75fd5771c3804420ef37
Update result-menu! to point to result-menu+

Seems this was accidental when result-menu+ was introduced in 2239e7b9822d3aec919f5a838c6435fdd4ccd8f4
Remove remaining unused behaviors
Remove references to nonexistent :resize behavior

Behavior was removed in 1fd123d8355036389eccbc1e07e920b99202acc2
Address user confusion around plugin.json vs plugin.edn #1677 #1141

Also addressed whitespace in validate
Be explicit about version format to prevent #1677
Merge pull request #1646 from cldwalker/update-behaviors

Update behaviors
Merge pull request #1679 from cldwalker/plugin-submission-message

Clearer plugin messages
Fix Haxe extension per #1539
Print /fullpath/file in the message if the file was modified or deleted.

If two files with the same name were modified or deleted then we don't
know which one is about to be reloaded or saved.
tabs: rounded top corners look better that sharp edges
Merge pull request #1438 from Bost/rounded-tabs

tabs: rounded top corners
Update warn-delete to convention of editor as first arg
Merge branch 'pr/1440'
Prevent adding same folder and file to workspace #775 #1588 #1217
fix regexp replace

Signed-off-by: Chris Granger <ibdknox@gmail.com>
Merge branch 'master' of github.com:Kodowa/Light-Table-Playground