created search buffer

[Arfs6]

Created a minimal search buffer. It definitely needs more work. I didn't wanted to go far on the wrong way.

1. created: src/controller/buffers/mastodon/search.py - It has the SearchBuffer. It inherits from BaseBuffer. It overwrites start_stream and remove_buffer. My mastodon account doesn't have enough activity for me to test pagination and create the get_more_items method. Does search really have pagination and is it ordered?
2. edited src/buffers/mastodon/init.py - imported SearchBuffer for Controller.create_buffer to access
3. edited src/mastodon/handler.py - edited the pub send message part of the search method to create the appropriate buffer with the appropriate info.
4. edited: mastodon.defaults - Added [other_buffers][[post_searches] list to hold already created searches.
   We could add support for hashtags with this easily. And what way should we take care of searches that yields zero results.

[manuelcortez]

This looks promising. Have you actually checked text searches? I'm already on a full time job and a part time one, so have had no time recently. But I definitely will take a deeper look this weekend. I'd like to know if this has been already tested as I have not yet text searches on my test instance.

[Arfs6]

From the mastodon.py's docs:

Full-text search is only enabled if the instance supports it, and is restricted to statuses the logged-in user wrote or was mentioned in.
Copied from the docs string documentation of the search method ( mastodon/search.py ).
Regarding the testing part, I am not sure if it really works. Searching for some words I wrote yields some posts. I have very little posts and just recently moved to a new instance.