Allow storing library.zip and other depedencies alongside the main application

[LeonarddeR]

Library.zip and other dependencies are now stored in a lib folder. It would be great if this could be configurable, i.e. load the dependencies from the application's root directory.

I understand that this is hardcoded in the compiled base executable. May be it could be considered to add a #ifndef CX_PATH_FORMAT check, so people can compile their own base executable with an overriden definition while not requiring to override common.c as well.

[marcelotduarte]

For Linux PR #518

[marcelotduarte]

Since 7.1 has an option zip_filename.
In other words, it can have library.zip or any other name, and you can also choose not to have a zip file.
I'm closing the issue as I have no plans to remove the lib directory.