[NTVDM]
- Rename flags;
- Improve VgaUpdateTextCursor a bit (and fix a bug);
- Improve a DPRINT and monitor CGA ports (for debugging purposes);
- Code styling.

git-svn-id: svn://svn.reactos.org/reactos/trunk/reactos@65422 97493ccd-5924-5043-b1f5-66cb403b36ce
[NTVDM]: Code formatting only!

git-svn-id: svn://svn.reactos.org/reactos/trunk/reactos@65423 97493ccd-5924-5043-b1f5-66cb403b36ce
[NTVDM]
- Do not recalculate at each refresh the new resolution that usually does not change (if it changes because of a modification of some VGA register, we detect that, and we change the vga mode). So keep the current resolution and use it in paint functions.
- Really reenter a new text/graphic mode when needed (ie. when alphanumeric bit and computed resolution change), this avoids useless console screenbuffers recreations (and flickering), things go faster, yet the VGA registers are still updated (as expected). See r65379, r65018 and r65015 for more details.

git-svn-id: svn://svn.reactos.org/reactos/trunk/reactos@65424 97493ccd-5924-5043-b1f5-66cb403b36ce
[NTVDM]: Use the ScreenMode variable in other places too...

git-svn-id: svn://svn.reactos.org/reactos/trunk/reactos@65425 97493ccd-5924-5043-b1f5-66cb403b36ce
[NTVDM]
- Remove unneeded commented code;
- Fix few things related to committing the reserved low-memory VDM page by kernel32;
- Decommit this memory when we terminate NTVDM.

git-svn-id: svn://svn.reactos.org/reactos/trunk/reactos@65426 97493ccd-5924-5043-b1f5-66cb403b36ce