Use "local" instead of "all-local" by default because "all-local"
requires admin privileges
Other improvements:
* Replace urllib with requests to make the management of the HTTP
requests simpler (better error handling and easier implementation of
complex requests in the future)
* Refactor the functions used to build the HTTP request to improve
maintainability (don't know if it makes sense to keep a single
function for the "search" and the "list videos" request).
* Use "urlencode" to generate the Kodi URL using a dict to make it more
generic.
* Create a function to log messages easily in Kodi's debug log. It will
decrease the amount of duplicate code.
* Fix some errors reported by pylint with regards to PEP 8
- when browsing ( and not searching ) it is possible to select
filter=local that will show only local video
- create dedicated method to build kodi and peertube api url
- bumped version to 0.3.1.1 to indicate this change
- if selected upstream might want to change it to 0.3.2