Various improvements to scripting lang

- Errors will now be more precise, there are now 2 separate errors for a function lookup failure and a failure inside a function
- Errors will now show which line number they failed at, instead of the character offset
- Minus values are not considered errors anymore, however, printing them does not work well
- Gotos now make a @RETURN variable to make making functions easier

source/tegraexplorer/common/common.h

@@ -21,10 +21,11 @@ enum utils_err_codes_te_call {
     ERR_EMMC_WRITE_FAILED,
     ERR_FILE_TOO_BIG_FOR_DEST,
     ERR_SD_EJECTED,
-    ERR_PARSE_FAIL,
+    ERR_SCRIPT_LOOKUP_FAIL,
     ERR_CANNOT_COPY_FILE_TO_FS_PART,
     ERR_NO_DESTINATION,
-    ERR_INI_PARSE_FAIL
+    ERR_INI_PARSE_FAIL,
+    ERR_IN_FUNC
 };
 
 extern const char *utils_err_codes_te[];