cosmoV_throw() now resets the vm stack as well

also a minor GC bug in cosmoO_newError was fixed.

i'm going to try to phase out cosmoM_freezeGC & friends
since that would cause hell with this new
error handling solution. the only thing still using it is the GC.

src/cparse.h

@@ -4,8 +4,7 @@
 #include "clex.h"
 #include "cosmo.h"
 
-// compiles source into CChunk, if NULL is returned, a syntaxical error has occurred and pushed onto
-// the stack
+// compiles source into CChunk
 CObjFunction *cosmoP_compileString(CState *state, const char *source, const char *module);
 
 #endif