add list tracks command

…into v1.3

As LibraryParser is fixed, the PlaylistList and TrackList commands
can use multiple words command phrase.
Add the commands' cases to LibraryParserTest
Fix LogicManagerTest to use PlaylistListCommand instead of ListCommand.

Update gitignore for vscode

Add PlaylistSearchCommandParserTest
Refactor DeleteCommandTest to PlaylistDelCommandTest
Update multiple test files

Refactor FindCommandParser to PlaylistSearchCommandParser
Refactor DeleteCommand to PlaylistDelCommand
Update FindCommand & LibraryParser

As Player will only be used in Command subclasses,
I converted the PlayerManager to be a singleton.
The singleton is only used in the Command abstract class.
This way, all subclasses will have access to the player instance.

An alternative would be to add a Player parameter to
every Command subclasses similar to how CommandHistory
used to be a parameter before the refactoring stage.
The argument for not going with this alternative is that
not all Command subclass need to use the Player,
just like CommandHistory was only used by undo and redo.
Also, I prefer to avoid further mass refactoring nightmare.

Of course, we need to be mindful of the consequences of
using singleton as singleton class is essentially a global variable.
We try to use it sparingly.
Pretty sure this is the only time where we need singleton.

Honestly, the initial codes of the AddressBook was not very
intuitive/friendly for integrating new components,
or dependency injection.

Add PlayCommandParser

Change LibraryParser switch case for play command
to use PlayCommandParser

Due to the Java bug where JavaFX MediaPlayer
does not play photoshopped album art
https://bugs.java.com/bugdatabase/view_bug.do?bug_id=JDK-8210828

After you entered a command in the UI CommandBox,
you should be able to press up/down key to navigate the commands
you have entered.

This is a regression from the refactoring stage.

SelectCommandSystemTest
As LibraryParser regex is now detecting first 2 alphabetical words
as the command phrase, the test case should expect
unknown command message.

CommandBoxTest
As we are not using ListCommand,
change the command that succeeds to PlaylistListCommand.

Implement PlayCommand

…rackCard and TrackListPanel

…to UI

…el library for an added track

…nd to libraryParser

Create TrackListPanel in UI component

Includes Player component

…into david

…o library folder

…DeveloperGuide.adoc

Add PlaylistDelCommandParser
Add 4 sample Playlists

Implement `track search` command and track list panel UI

Implement playlist search and delete commands

TrackScanner checks if /library doesn't exist or is empty
then it copies the contents of resources/library out

If it is compiled to a jar file, it runs the command line:
unzip "library/*"

Else when running in IDE, it basically copies the contents

…mmandTest and add Playlist methods: hasTrack(), deleteTrack()

Add/delete track command for managing playlists

Update the quick start
Fix search commands to remove q/
Fix delete commands to remove i/

Basically use string.contains to search

V1.3

…tPanel and playlistListPanel