QB64 Error handling being upgraded...

I'm currently working on the (rather boring) task of upgrading QB64's error handling to make it even more like QBASIC.

The upgrade will address issues such as:

i) Multiple errors being reported for a single command:
Example:
a=SQR(-1)+SQR(-1)+SQR(-1)
In QBASIC: Creates 1 error
In QB64: Creates 3 errors!

ii) Processing of SUBS/FUNCTIONS with invalid data returned from a previous error calculating one or more of the SUB/FUNCTION parameters.
Example:
PRINT SQR(-1)
In QBASIC: Didn't print anything
In QB64: Prints 0

iii) Incorrect handling of errors occurring inside conditional statements:
Example:
IF SQR(-1)=2 THEN PRINT "QBASIC PRINTS THIS!"
In QBASIC: After RESUME NEXT, it prints the message
In QB64: After RESUME NEXT, it skips the conditional expression. Furthermore, after RESUME it runs the wrong line of code.

There will always be some differences between QB64's error handling and QBASIC's error handling. These are:
i) OVERFLOW errors will not happen in QB64
ii) In a line such as:
a=SQR(-1)
The value of a will be undefined.