add unsigned for soundbites start time and duration

change Database connection import with db_connect helper

fix signature regex

update php dependencies

update types and some remap logic

fix some style issues

When first visiting the home page, users would see an error message that was normal because Castopod
Host wasn't installed yet. From now on, the error is caught to redirect users directly to install
page, preventing them seeing the error and thus, resulting in a better user experience.

fix episode, podcast and persons forms + episode scheduling

Apple podcasts requires a category to submit a valid podcast RSS feed. The "uncategorized" category
is not a valid category.

+ fix typo: missing extension in lint-commit-msg.sh script

prettify composer.lock file

- fix: set mediaBaseURL as baseURL if not defined
- update dev documentation seting up a dev environment