Add a feature to set a chess clock for both players

[LabinatorSolutions]

A feature to set the time for both players can be valuable for this chess web GUI. That will allow the players to challenge the engine under different time modes (Bullet, Blitz, Rapid, and Classic).

Two fields are required to implement this feature. The time and the possible increment per a set of moves.

• The range of the time and its increment should fall between 1 minute and 180 minutes inclusive.
• The time and its increment value should be restored when taking back a move.