[KERNEL32]: Cleanup and fix the Global* APIs for heap allocation. Mostly parameter...

[KERNEL32]: Cleanup and fix the Global* APIs for heap allocation. Mostly parameter check fixing, checking for errors and failure cases, as well as adding SEH (no real functionality improvement, other than fixing a security issue in GlobalLock).
[KERNEL32]: Rename hProcessHeap to BaseHeap, and only allow the heapmem.c access to this (change find.c to use RtlGetProcessHeap() like everyone else).

svn path=/trunk/; revision=53068