Emby for Home Assistant 0.0.15

What's Changed

• docs: Emby stream URL research (closes #218) by @aperim-codex in #230
• feat: add get_stream_url helper (closes #219) by @aperim-codex in #232
• feat: add Emby media_source provider (fixes #220) by @aperim-codex in #233
• feat: adapt browse tree for device-less playback (closes #221) by @aperim-codex in #234
• fix(media_player): delegate media_source playback to HA core (closes #222) by @aperim-codex in #235
• docs: finalize device-less playback docs & version bump (closes #223) by @aperim-codex in #236
• feat: entity-less media browser support (closes #237) by @aperim-codex in #239
• docs(tests): entity-less media browser coverage & docs (closes #238) by @aperim-codex in #240

Full Changelog: v0.0.14...v0.0.15