CORE-19575
For the time being, don't add read-only attribute for ease of testing
and modifying files, but it won't always stay this way.
For example, Windows sets its boot.ini (as well as NTLDR, NTDETECT.COM
etc.) as read-only (+ hidden and system) during its 1st-stage setup.
2nd-stage setup makes some adjustments in boot.ini but doesn't restore
its read-only attribute.
Windows tools that can modify boot.ini (i.e. msconfig.exe, bootcfg.exe,
and sysdm.cpl) **ALL** know how to remove the read-only attribute for
modifying boot.ini, before restoring it if needed.
The BootDrive and BootPartition values are deprecated, and support
for them will soon be removed from FreeLoader.
Add an helper function to migrate these values during ReactOS
(re)installation / update.
The support is so far enabled only for INI files (freeldr.ini, boot.ini).
May be subject to further improvements in the future.
Usage examples:
- When finding existing ReactOS or Windows installations, the boot store
should exist and is opened in read-only mode. Closing the boot store
doesn't store any temporary modifications made to it.
- When doing a clean installation, freeldr.ini is created in read-write
access.
- When installing with an existing freeldr.ini or boot.ini, they are
opened as existing files in read-write access.
- QueryBootStoreOptions(): De-duplicate code.
- SetBootStoreOpt(): Respect the FieldsToChange flag.
- BOOT_STORE_OPTIONS: Remove unused Version field and distinguish
between "Current" and "Next" BootEntryKey.
- If a section already exists, return the existing one. This allows
avoiding different section entries with the same name in the cache.
If an INI file has separate sections with the same name, their
contents (key-values) get merged into a unique section.
- If a key-value already exists, update its data value and return the
existing one. (Note that this may be subject to behaviour change in
the future.)
This includes:
- the default TimeText;
- the default colors.
They can however be changed by the user at one's convenience, by
explicitly specifying different values.
