UI: swap/fix ship hp bar colors
Add couple TODO comments
Manu: always exclude events/handlers from entity rjr retrieval

Fixes small regression due to recent introducing of events
and handlers to manu where error was being thrown due to
attempt to call properties which Event / EventHandler do not
define.

Simply exclude these entities from the candidates to retrieve.
UI: handle construction related events

Render construction progress using the progress bar,
remove upon completion / failure
UI: Follow up TODO comment