agFM v1.46 released

The new 1.46 version has a few changes/improvements:

1. New agFM boot files (+ Ventoy support)
2. Some partition references changed to use (e.g.)  hd0,1 instead of hd0,msdos1. This allows the E2B version of agFM to be used on non-legacy partition drives such as gpt drives. Note that some functions such as .imgPTN and .isodef (partnew) won't work on GPT drives and I don't support GPT drives!
3. The variable grubfm_startbat can now be used to define a different start.bat file which is run at the start of Windows Setup. This just provides a way to 'hook' in a custom batch file and will not be of value to most users.
4. SAMPLE_startup_menu.txt re-organised
5. \grldr and \boot\grub\menu.lst file added to allow a system to MBR boot to the agFM partition and then load agFM (grub2).
6. Some README files added to \boot\grubfm folder
7. Load agFM startup menu.cfg copied to root of agFM folder to allow user to re-run the startup menu.
8. Enable or Disable UEFI booting.mnu file added to \e2b folder (for copying to \_ISO\MAINMENU of partition 1 if required).

Item 5 above means that you may now be able to MBR-boot to agFM from the second partition (e.g. using the BIOS boot menu).

This is useful if you have switched in a .imgPTN23 file which does not contain grub4dos or the CSM menu. For instance, you can boot to agFM from the E2B menu. switch in a .imgPTN23 file (no checks are made as to what the new partition contains) and then from the agFM menu you can boot from a file on the new partition #1 or run a grub2 grub.cfg file from partition #1.