src: avoid implicit type conversions
This fixes a bunch of C4244 ('conversion' conversion from 'type1' to 'type2', possible loss of data) MSVC warnings in the code base.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This fixes a bunch of C4244 ('conversion' conversion from 'type1' to 'type2', possible loss of data) MSVC warnings in the code base.