Better Interpolation support

[worksofliam]

See the pug docs here for Interpolation: https://pugjs.org/language/interpolation.html

apug needs support for these two things:

Inline variable support (done)

p Written with love by #{author}
p This will be safe: #{theGreat}

This needs to be parsed out in ProcessLine the processing mode is MODE_VAL: https://github.com/WorksOfLiam/apug/blob/master/src/apug.rpgle#L495

Dot at end of tag support

This functionality is similar to the pipe (|) feature, in that everything in the scope of the tag will be in the value of the tag.

p.
  This is a very long and boring paragraph that spans multiple lines.
  This is yet another line.
  This is also yet another line.

[worksofliam]

Inline variable support is now included: 821620f