Define first player for #708 and for #738

[ddugovic]

First player has at least two meanings:

• Which player has the greater reputation? (ou / gyoku)
• From which perspective do we wish to view a game?

This PR does not modify art assets, but does change the "Player before" definition to consider:

• Humans have a greater reputation than engines
• Titled players have a greater reputation than non-titled players

Although Lichess TV prefers to display games from the perspective of the higher-rated player, for Lishogi TV we should prefer to view a game from:

• Handicap games: handicap receiver perspective
• Human perspective (or if BOT versus AI, BOT perspective)
• Higher-rated player perspective

[WandererXII]

LGTM, thanks! Maybe we should rename firstColor and firstPlayer to something else, so it doesn't sound like first player to move.

[ddugovic]

Indeed... maybe something like tvColor and tvFirstPlayer since existing names (e.g. "orientation", "pov") don't seem to be a good fit either.

But also sentePlayer before gotePlayer identifies the player with greater reptuation, which someday could be useful for assigning the king general versus jewel general pieces.