Enhancements to Panels

[ChuanyuXue]

Schedule Panel:

• The x-axis shall range from 0 to the cycle value.
• The x-ticks shall be sorted in an ascending manner.
• The x-ticks shall be uniformly distributed (the gap between two adjacent ticks should be equal).
• The schedule panel shall show the next link ID after K seconds (like slides).

Topology Panel:

• Change the layout to make the topology span within the panel.
• Remove the background image.

System Clock Panel:

• The x-axis shall range from the lower bound to the upper bound (currently, it's fine to be constant from -1000 to 1000).
• Use different colors for BC, Slave, GM.

Statistic Panel:

Delay:

• The axis shall auto-scroll along time (the last tick shall be labeled with the latest timestamp).
• Rename "historical delay" to "delay."

Logs Panel:

• The logs panel shall automatically scroll to show the latest logs.
• The logs shall have highlight and shall be formatted. (You can refer the Linux dmesg print style)

[ChuanyuXue]

Nice done! Thank you so much for the contribution!