0.5.3

Lorenz 0.5.3 includes yet-another set of bug-fixes:

• Mercury/GH-14: Inheritance completion now considers elevated return types
• Bombe/GH-11: Bump Bombe dependency to 0.3.2, including a fix for remapping
  manifests without a Main-Class attribute
• Lorenz/GH-30: Don't wrap Writers in TextMappingsWriter, allowing files
  larger than BufferedWriters buffer to be written (thanks to @phase for this
  bug-fix)
• Lorenz/GH-32: Support blank comments in IO readers (affects SRG formats, JAM,
  and Enigma)

Support for yet-another SRG variant, XSRG, has also been introduced with this
release - the format is the same as the SRG format, though has field types
(Lorenz/GH-33).

Thanks to @phase and @DemonWav for their contributions towards this release.

Registries

Registry has been expanded to expose more of the underlying Map's data:

• Registry#keys(), returning a Set of Strings which correspond to the
  identifier of registered values.
• Registry#entries(), returning a Set of Map.Entrys.

Improved Mapping Merging

Mapping Merging, introduced with Lorenz 0.5.0, has always been a fairly
lacklustre implementation - dropping mappings present on the b mapping set, if
there wasn't a mapping in the a mapping set.

Thanks to @DemonWav, that has now been resolved (see Lorenz/GH-36).