Refactor code to separate parse from binding generation specific files

[kunaltyagi]

In order to have a end-to-end integration, we need a lot more files for generation which is actually binding-framework dependent.

Moreover, I found that compile_commands might not be sufficient for pcl. It'd require another approach.

For starters, I think we should separate the parse and interface files from those needed just for generation from the json (or json representation) and reorg the tests as well