wip: working on analyzer

- Feat: add binary math analysis
- Fix: check for function context in block analysis
- Feat: add 'break' analysis
- Fix: few fixes in call analysis
- Feat: add class analysis
- Feat: add construct analysis
- Feat: add declaration analysis
- Feat: add field analysis
- Feat: add function analysis
- Feat: add loop analysis
- Ref: updated utilities and context functions

src/compiler/analyzer/utility.c

@@ -87,6 +87,9 @@ fzl_type_t an_toktotype(fzl_token_t *tok)
   if (tok->type == FZL_TOKTYPE_NAME)
     return FZL_TYPE_OBJECT;
 
+  if (strcmp(tok->value, "null") == 0)
+    return FZL_TYPE_NULL;
+
   if (strcmp((char *)tok->value, "i8") == 0)
     return FZL_TYPE_INT8;
   if (strcmp((char *)tok->value, "i16") == 0)