[Feature request] Team builder and song recommender enhancement

[dnaroma]

Motivation.

User can only add cards to team filtered by character and stars, which is not very convenient. Also, song recommender gives score of songs by random skill order, users want a possible range of score for better comparison.

Suggested Implementation

• Allow filtering cards by skill
• Give score range for songs in solo mode
• Give best skill order for single song in solo mode