Fixes
Bugfix (parentheses)
Fix a buffer overflow
Fixed uninitialized variable bug
Removed empty line
Fixed block mode redrawing bug
Removed unused variables
IsLine: don't process input as multiple double NULL-terminated strings, but as a single string

This is the assumption around the codebase, and the loop causes invalid data to be accessed
Comment typo
Fixed a bug with REM_SETBLOCKS
Fixed memory sizes
0A0Dh is a WORD
Removed double check