- PROTO_INTERFACE::GetIcon removed and replaced with the standard implementation;
- PS_LOADICON also replaced with the standard function;
- ProtoConstructor() & ProtoDestructor() macroses are introduced to simplify protocols' code;
- GetIcon() method implementation removed from all protocols

git-svn-id: http://svn.miranda-ng.org/main/trunk@3739 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c