- Made basic sector and side properties class variables rather than object properties (seems to save a lot of memory on large maps and speeds things up considerably - perhaps I should be avoiding using properties except for udmf stuff)

git-svn-id: http://mancubus.net/svn/hosted/slade/trunk@1397 1ddb354d-3e0c-0410-833a-d70222086f97
- Replaced all wx hash maps with std::maps (wx hash maps were using up way more memory than they should have)

git-svn-id: http://mancubus.net/svn/hosted/slade/trunk@1398 1ddb354d-3e0c-0410-833a-d70222086f97
- Improved speed of writing udmf maps (why was I doing so many unnecessary file writes?)
- Fixed some problems with saving udmf maps

git-svn-id: http://mancubus.net/svn/hosted/slade/trunk@1399 1ddb354d-3e0c-0410-833a-d70222086f97