Convinience constructors without messing up StaticArrays

[cserteGT3]

Copying LinkageDesigner, there should be constructors

• with identity rotation and only translation
• only rotation?
• rotating with n degrees around axis

But those should not be constructors, because that is type piracy (I think at least) and I'm not sure what other methods are covered.
Maybe the current rotation-translation methods should be also removed.

A good constructor function should be find, something like, and static-mutable type should be included:

• makehomogeneousmatrix
• makehm
• hm

[cserteGT3]

More ideas:

• statichommatrix, mutablehommatrix
• shommatrix, mhommatrix