LIBR PLUGINS

Plugins must be configured using the root ./configure-plugins script.

Libraries can be compiled:

as static libraries (a, lib, ..)

./configure-plugins --enable-shared --enable-dynamic

R2_LIBR_PLUGINS environment variable is honored as another search path for plugins

Plugins can be:

not compiled
compiled as shared
compiled as static (inside the related library)
```
libr/plugins/shared
libr/plugins/static
```

the configure-plugins script will regenerate the required Makefiles to build this stuff as defined.

PD: This is not implemented :)

--pancake