[doc] Rework the adding_component doc

- Some stuff has been moved to new_middleware
- Document _name, _short_descr, add_data, add_property with several
  examples
- Remove blender part that are now false
- TODO Write the builder part

Important progress to #289
[human] Completed adaptation for new builder-naming
[builder] Make sure that unparent_wheel is automatically called
[doc] Add a tag for moos
[doc] Rewrite new_middleware

- explicit how to add datastream handler in the class based method
- Provide specific explanation for each middleware, with various
  examples
- document how to add a datastream manager

XXX: maybe we must split it in two ?
XXX: write MOOS specific stuff when it is ready. See #275

Still, it fixes #281
[doc] Remove documentation about pocolibs_interface

It is now completly outdated
[doc] Split new_middleware in two, and reorganize a bit dev part
[builder] laser: create arc after renaming
[laser] fix visible arc for single layer only

remove LDMRS (3 layers) arc display which was broken
[doc] Remove obsolete example from components_library

Fix #283
[doc] Remove a reference to removed document 'editing_in_blender'
[doc] rework the integration page

- remove part about linking with blender
- try to summarize more precisely what is middleware layer.
- link with overlay

Mainly solve #274, but I'm not very happy with this page
[doc] Document MORSE_RESOURCE_PATH in man

While here, mention that we rely on python environment too.
Fix a few typos.
[doc] adding component builder part (WIP)