Performance & permission checking improvements

Changelog:

• Improved performance in tablist
• Improved performance of color parsing
• Improved player handling performance
• Fixed 'Not scheduled yet' error in tablist
• Fixed updating playername when a player changes their username
• Updated '/pr listranks' with fancy pages
• Updated '/pr listdefaultranks' with fancy pages
• Updated name & chat coloring to allow for more complex colors including gradient and rainbow
• Updated player retrieval by name in commands to allow for non-case-sensitive