KCINFR-979: establishing a service api for propdev budget subaward, promoting KcAttachment,  making attachment data structures not have to understand the location of a file icon.
KCINFR-979: minor refactoring of KcAttachmentService such that is doesn't depend on KcAttachment to get the icon path
Merge pull request #164 from leoherbie/s2s_api_budget_subaward

S2s api budget subaward