Update serverlist.txt so that by default all lines are comments
Right now the Unified branch has missing values intended to be filled in by the end user in serverlist.txt by default. If a user runs build.[sh|ps1] without changing the contents of serverlist.txt, the build script will call each line of serverlist.txt and attempt to execute in bash/powershell as is. A better approach is to make each line a comment by default and instruct the end user to uncomment the line once they have filled in the missing values. Both bash and powershell treat anything after a pound symbol (#) in a line as a comment, so start each line with a pound symbol. This ensures that by default when each line is called by build.[sh|ps1] the example commands are not actually executed by bash/powershell.