Remove ENABLE_NEW_LOADER configuration macro.

The new loader is enabled by default now.
Add a debug helper function for printing hashmaps.
Properly compare paths on worlds.

Previously, only the first world read from disk was recognized.
Emit a notice when showing invisible mode in debug build
Sort worlds
Fix windows crosscompilation errors.

As usual, the linux2win32 crosscompilation GCC is much more sensible
to incorrect C++ than the native Linux one. In this case, fully-specified
templates cannot be included into the implementation .cpp files, but only
in hedaer files, and additionally must be declared inline.
We need to patch mruby-pcre-regexp currently to build for windows.
This is an upstream bug; see
  https://github.com/mattn/mruby-pcre-regexp/issues/7
for more information. When that one gets closed, the patching can
be removed.