Update compiler safe fix feature

Here a first batch. As it would be probably a bad idea to fully update compiler v3.0 to v3.2 ; we can at least push fix some known issues and adding minor welcomed features. This doesn't deal with opcodes at all.

Most of patches come from commits from SourceMod, some from SA-MP community and few others from some Pawn version (diff from previous version). I've put reference in each commit.

When I could, this has been tested before and after. This should be safe.