[Bleeding] Fix formatting of optional arguments.
[Bleeding] Also blacklist ":" in plugin command aliases.
[Bleeding] Fix getCommand for conflicting plugin commands.
[Bleeding] Implement escape sequence for aliases.
[Bleeding] Support any number of arguments in aliases
Clean up alias handling.

There is no need to print a stacktrace when an alias fails, we do not do
this for normal commands. We also now give error messages when attempting
to register an alias instead of having them just silently not function.
Remove extra events from alias execution.

When executing an alias we already call an event for the alias itself. The
extra events are not needed for logging purposes as the alias itself is
logged and the events cause issues for plugins trying to do spam checking
on their own.
[Bleeding] Update Tell and Help aliases to use alias system.
Updated version to 1.7.2-R0.3 in pom.xml for Beta.
Updated version to 1.7.2-R0.4-SNAPSHOT for development towards next release.