This problem has been identified while fixing #11131 .

Description of the Issue

Some members (_line2go, _column2go and _pos2go) from the CmdLineParams & CmdLineParamsDTO structs (".\PowerEditor\src\Parameters.h") need int to intptr_t change to support 2GB+ files. Saving & loading of the 'session.xml' needs a 2GB+ adaptation too.

Steps to Reproduce the Issue

1. Open 64-bit N++ (v8.3+).
2. Load a 2GB+ file (I will use a file with exactly 2 GB = 2147483648 B as an example here).
3. Make sure you have the 'Remember current session for next launch' checked in Settings -> Preferences... -> Backup.
4. Scroll down & move cursor to the very end of this file (check that the 'Pos:' in the bottom status bar shows at least 2147483649).
5. Close the opened N++.
6. Go to a folder, where you have your 'session.xml' file stored (for portable N++ it will be the same folder, where is the main N++ executable 'notepad++.exe') and open that file.
7. You will see the result of an int integer overflow - incorrect negative values endPos="-2147483648" startPos="-2147483648"

Expected Behavior

You see correct positive values `endPos="2147483648" startPos="2147483648"

Actual Behavior

After the saved N++ session is restored, the cursor is not at the end of the 2GB file, where it was left before.

@donho
I can do a PR for this if you agree with this proposal.