Filter "- Live" for Spotify tracks

Closes #1973.

src/connectors/spotify.js

@@ -18,7 +18,7 @@ Connector.currentTimeSelector = '.Root__now-playing-bar .playback-bar__progress-
 
 Connector.durationSelector = '.Root__now-playing-bar .playback-bar__progress-time:last-child';
 
-Connector.applyFilter(MetadataFilter.getRemasteredFilter());
+Connector.applyFilter(MetadataFilter.getSpotifyFilter());
 
 Connector.isScrobblingAllowed = () => {
 	return isMusicPlaying();

src/core/content/filter.js

@@ -221,6 +221,18 @@ class MetadataFilter {
 		);
 	}
 
+	/**
+	 * Remove "Live..."-like strings from the text.
+	 * @param  {String} text String to be filtered
+	 * @return {String} Filtered string
+	 */
+	static removeLive(text) {
+		return MetadataFilter.filterWithFilterSet(
+			text, MetadataFilter.LIVE_FILTERS
+		);
+	}
+
+
 	/**
 	 * "REAL_TITLE : REAL_TILE" -> "REAL_TITLE"
 	 * @param  {String} text String to be filtered
@@ -354,6 +366,16 @@ class MetadataFilter {
 		];
 	}
 
+	static get LIVE_FILTERS() {
+
+		return [
+			// Track - Live
+			{ source: /-\sLive?$/, target: '' },
+			// Track - Live at
+			{ source: /-\sLive\s.+?$/, target: '' },
+		];
+	}
+
 	/**
 	 * Get simple trim filter object used by default in a Connector object.
 	 * @return {MetadataFilter} Filter object
@@ -387,6 +409,21 @@ class MetadataFilter {
 		});
 	}
 
+	/**
+	 * Get predefined filter object that uses 'removeRemastered' function.
+	 * @return {MetadataFilter} Filter object
+	 */
+	static getSpotifyFilter() {
+		return new MetadataFilter({
+			track: [
+				MetadataFilter.removeRemastered, MetadataFilter.removeLive
+			],
+			album: [
+				MetadataFilter.removeRemastered, MetadataFilter.removeLive
+			],
+		});
+	}
+
 	/**
 	 * Get predefined filter object that uses 'removeDoubleTitle' function.
 	 * @return {MetadataFilter} Filter object