cleanup Camera tools

[bgruening]

FOR CONTRIBUTOR:

• - I have read the CONTRIBUTING.md document and this tool is appropriate for the tools-iuc repo.
• - License permits unrestricted use (educational + commercial)
• - This PR adds a new tool or tool collection
• - This PR updates an existing tool or tool collection
• - This PR does something else (explain below)

This PR cleans up the camera tools. It's:

• removing the external datatypes, which are shipped with Galaxy now.
• add missing single quotes
• annotates the R scripts to make this tool work in pulsar
• adds argument and unifies the parameter help section

[bgruening]

This is needed, because Galaxy does not know that lib.r belongs to the tool. CAMERA_combinexsAnnos.r can be deduced from the command section, but lib.r not. This feature is new and needs the 21.09 Galaxy release.
The advantage is that it will make this tool for in pulsar.

[lecorguille]

Good to know!

[lecorguille]

Do we need to update planemo or something ?

[bgruening]

Oh yes, probably. I will see if I find time for that. Is the rest fine with you?

[lecorguille]

Sure all good for me!
Thanks

I will have to apply the same <required_files> to many other tools

[hechth]

@Lain-inrae what would be needed to revive and merge this PR? I think getting CAMERA and such tools back up to date would be great :) or @yguitton is this already outdated?