[SETUPLIB][USETUP] Partition code improvements.
- SETUPLIB and USETUP: Convert PARTENTRY::DriveLetter to WCHAR.
- SETUPLIB: Retrieve volume label.
- SETUPLIB and USETUP: Move the partition types (IDs) table from
USETUP to SETUPLIB so that they can share it with the 1st-stage
GUI installer too. Also take the opportunity to update the table
with information from http://www.win.tue.nl/~aeb/partitions/partition_types-1.html
and cross-checked with the list from Paragon Hard-Disk Manager.
- USETUP: Simplify PrintPartitionData().
- Add some code comments.