Suggestion to include indicator of economic value (e.g. GDP) and social(+economic) development (e.g. HDI) into exposure category codelist - this is a gap that surfaced when adding some GFDRR exposure data (R5 project)

delete codelists> csv directory (superceded by schema > codelists > open / closed)

adding `indicator_index_value` to be used with new exposure_category `economic_indicator` and 
`development_index`

Adding cm unit to IMT.csv for flood depth

1. Updating to include Rockfall kinetic energy, spectral acceleration at specific common periods, and inundation depth above floor level (useful in vulnerability curves).
2. On water depth, renamed as inundation depth and removed specific reference to flood or tsunami, so both hazards can use the same indundation depth metric. Removing duplication
3. On flow velocity removed specific reference to flood, landslide or tsunami, so all hazards can use the same indundation depth metric and extended the description to make it relevant to use on all fluid flows. Removing duplication

1. revise 'downtime' to the more formal 'disruption'
2. include number of days people can be displaced (adding to number of people displaced)
3. separated out casualty and fatality count, ratio for clearer definition

Add commercial licence explicitly. Open list, so other custom licences can be added for specific use cases.