Apartment: xacro file must be compiled into URDF

[daniel86]

the urdf library used by knowrob cannot handle xacro statements, thus the apartment.urdf file must be compiled by xacro.
either the file should be uploaded into github, or we do it compile-time.

side-note: shouldn't have the apartment.urdf file have the ending "xacro"?

[HoangGiang93]

the urdf library used by knowrob cannot handle xacro statements, thus the apartment.urdf file must be compiled by xacro. either the file should be uploaded into github, or we do it compile-time.

side-note: shouldn't have the apartment.urdf file have the ending "xacro"?

I changed the name from apartment.urdf to furnitures.xacro, because it contains a part of apartment.
Then I created a new apartment.xacro, which contains furnitures.xacro and kitchen.xacro.
You can use the apartment.xacro to generate apartment.urdf.
I also changed the code in CMakeLists.txt.