Small SectInfo improvements
Brought on by the third point of ticket 4433, which is about !192, but also affects the default branch, and these changes should be easy to adapt for that MR:
- Refactor
SectInfo
's destructor into a newClear
function - Clear a map's
SectInfo
upon encountering it when parsing aSECTINFO
lump, which allows patch WADs to override a map'sSECTINFO
instead of it being additive - Fix some memory leaks in that function.