Update for SpecialSource inheritance map access change
Cleanup organization of plugin mapping resources
Add support for 'unversioned' plugins via cross-version NMS 1.4.7-1.2.5 remapping

Allows for compatibility with NMS plugins which were built for older
versions of CraftBukkit, or without the safeguard package version.

Includes cross-version mappings from https://github.com/agaricusb/MinecraftRemapping,
generated by chaining through MCP's numeric "srg" mappings. These
mappings are intended to be consistent as possible across Minecraft versions,
even after obfuscation. New CB/mc-dev 1.4.5, 1.4.4, 1.4.2, 1.3.2, 1.3.1, 1.2.5
to obfuscated 1.4.7 mappings are included with this commit.

Disabled by default - to enable, edit bukkit.yml mcpc.plugin-settings.
remap-obc-pre will remap unversioned OBC (simple package rename, no mappings),
and remap-nms-pre accepts a version string to remap the unversioned NMS from
('false' to disable) using the included mappings. This can be one of the the above
versions for cross-version mapping, or a current version (for new plugins written
against special builds of CB without the version shading, see #182). That is, one of:
1.4.7, 1.4.6, 1.4.5, 1.4.4, 1.4.2, 1.3.2, 1.3.1, 1.2.5, or false.

Cross-version compatibility is not guaranteed. Incompatible code changes
between game versions are out of the scope of this feature; only recognized symbols
trackable across versions are remapped. Works best with plugins making only limited
use of NMS/OBC, your mileage may vary.