Thim 0.11.2

• Dispatch generated template registries through a class index instead of linear == and
  instanceof chains. With 422 page models the last model cost about 1.1 µs per request;
  every model now resolves in a few nanoseconds. Subclasses of open models still fall back
  to the previous instanceof chain. The new registry also compiles faster: ReAI's
  compileJava for 344 renderers fell from 10.8 s to 6.3 s.
• Write the message usage manifest whenever a catalog exists, so generateMessages=false
  keeps build-wide dead-key detection. A module can now render templates from a catalog
  whose typed factories another module generates instead of compiling a second factory class.
  The module-local unused check that previously ran at compile time is replaced by the
  build-wide thimMessageUsageCheck.
• Record the measurements behind these changes, and the buffer and text-encoding ideas
  that were rejected, in the performance audit.