Added motoman_resources package.

[Doomerdinger]

Made robots use materials from that package so they do not conflict when using multiple arms.

Also added a common macro file that can be used to load kinematic parameters and other values.

Related to #314

[gavanderhoorn]

I'll do a proper review later, some high-level comments now:

• please don't manually bump versions of packages. This will all be done automatically by the release pipeline. Please revert all those changes to the manifests
• same goes for the CHANGELOG file: it's added automatically, so please revert the addition
• please add at least one ROS-I maintainer (me). See the other packages for the metadata to add to the manifest
• and it's a minor point, but I believe you've copied the structure/approach from fanuc_resources or one of the other similar packages. I realise we're in the same 'context' here (ie: ROS-Industrial), but technically, I believe it would've been good to at least mention that somewhere, as the license of those packages requires

[Doomerdinger]

I'll do a proper review later, some high-level comments now:

• please don't manually bump versions of packages. This will all be done automatically by the release pipeline. Please revert all those changes to the manifests
• same goes for the CHANGELOG file: it's added automatically, so please revert the addition
• please add at least one ROS-I maintainer (me). See the other packages for the metadata to add to the manifest
• and it's a minor point, but I believe you've copied the structure/approach from fanuc_resources or one of the other similar packages. I realise we're in the same 'context' here (ie: ROS-Industrial), but technically, I believe it would've been good to at least mention that somewhere, as the license of those packages requires

Didn't realize the release pipeline took care of versions/changelog, I'll be sure to not do that moving forward.
I'll add you to the packages, and mention the fanuc package.

[gavanderhoorn]

Replacement in #405 (with additional commits migrating more support packages to use the resources package).

Thanks for the initial PR @Doomerdinger 👍