Modularize CMake build configuration

Build type no longer defaults to Release (!)
have separate options for extra warning flags and sanitizers

toss DEVELOP macro

Fix sanitizers with CMake while I'm at it :|

Makefile

@@ -198,7 +198,7 @@ develop:
 		-fsanitize=unreachable -fsanitize=vla-bound \
 		-fsanitize=signed-integer-overflow -fsanitize=bounds \
 		-fsanitize=object-size -fsanitize=bool -fsanitize=enum \
-		-fsanitize=alignment -fsanitize=null -DDEVELOP" CFLAGS="-ggdb3 -O0"
+		-fsanitize=alignment -fsanitize=null" CFLAGS="-ggdb3 -O0"
 
 # Targets for the project maintainer to easily create Windows exes.
 # This is not for Windows users!