Consider adding or aligning to attributes from ICMS to support cost comparisons

[duncandewhurst]

ICMS includes various project attributes to support cost comparisons. According to ICMS:

These attributes have been carefully selected and are limited to those that have a direct bearing on the costs.

We should review ICMS's attributes for:

1. attributes in common with OC4IDS, which may be opportunities to align or improve OC4IDS's field descriptions and/or codelists
2. attributes missing from OC4IDS, which may be opportunities to add new fields to OC4IDS to support cost comparisons

From a quick look, ICMS's site attributes look like the best candidate for 2.

ICMS also defines many attributes that are specific to particular project types, which may be too much detail for OC4IDS.