add return value to expirePolicy in IRiskpoolService

v1.6.0-staging-e

add return value to expirePolicy in IRiskpoolService

minor fix

v1.6.0-staging-d

minor fix

refactoring and fixes

v1.6.0-staging-c

refactoring and fixes

rename securePolicy to collateralizePolicy, introduce explicit amounts

v1.6.0-staging-b

introduce explicit amounts

initial step for riskpools

v1.6.0-staging-a

initial step for riskpools

simplfied IPolicy structs

v1.5.0-staging-k

restructure IPolicy structs

solidity 0.8.2, oz 4.7, refactorings

v1.5.0-staging-j

freeze solidity to 0.8.2, upgrade oz to 4.7.0, some refactoring

minor bugfix

v1.5.0-staging-i

minor bugfix

minor bugfix

v1.5.0-staging-h

minor bugfix

define component status/type as enums

v1.5.0-staging-g

define component status and type as enums