Pipeable methods for parsers and formatters

[OliverJAsh]

At the moment there is only one exported then function which works on Match, however I think we also need versions to cover Parser and Formatter (to replace the corresponding methods on those types).

Perhaps we could have separate modules for Parser, Formatter and Match. WDYT @gcanti?

[StefanoMagrassi]

@OliverJAsh with the current situation (only an index.ts file) we would have the problem of names clashing.

Thus, maybe we could separate the source code in different modules and then add the pipeable version of those methods.

It shouldn't be an expensive task, but I think that we have to do some "chores" on the project (upgrade dependencies, remove tslint and so on...) before.