Named formatters are interfering with DateTime formats (and others)

[scottrippey]

Currently, the Named Formatter syntax (eg. {0:formatter:format}) is interfering with valid formats, such as {Date:hh:mm:ss}.

[scottrippey]

Possible solutions:

1. Change the syntax so it doesn't use double-colon.
   Eg. {0,formatter:format} or one of the other discussed options.
2. Make the named formatter feature smart -- if no formatter is found with that name, then assume it's not a named formatter.
   For example, look for a formatter hh with format mm:ss, and if it isn't found, use the default formatter with format hh:mm:ss.

[scottrippey]

Sorry, duplicate of #50