[Feature Request]: Add External Player Support

[MarmadileManteater]

Guidelines

• I have searched the issue tracker for open and closed issues that are similar to the feature request I want to file, without success.
• I have searched the documentation for information that matches the description of the feature request I want to file, without success.
• This issue contains only one feature request.

Problem Description

FTC has never supported external players.

Proposed Solution

Use intents to allow the user to select a media app (ex: vlc) and launch videos externally.

Alternatives Considered

It could be written to use supported links which have custom origins such as app://, but not all apps have those.

Issue Labels

new feature

Additional Information

It may be necessary to change the UI for the external player settings to accommodate this change.