load libraries *declare*d in -meta file

[umlaeute]

it would be great if the libdir mechanism could support multi-binary libraries better.

e.g. right now Gem duplicates quite some code from libdir (searching for a specially named file and adding the path to it), but still requires for the actual Gem.dll to be dlopen()ed.

it would be great if a libdir-loaded Gem would make sure that the Gem.dll is opened as well.

draft

i think this could work, if libdir could do some additional steps:

• check for meta-file
• add the path to meta-file to the canvas-local search path
• parse the meta-file for declare lines
• load any libs (and add paths) mentioned in declare.

in practice this is not trivial (my feeble attempts to implement this failed so far)