qga: Add 'guest-get-users' command

Changes since v3:
- Removed ifdef/endif around QGA_MICRO_SECOND_TO_SECOND

Changes since v2:
- Updated the documentation of login-time to be more precise what the value
  contains and what time is actually reported and in which format.

Changes since v1:
- fixed spelling issues in the commit message and schema
- added login-time field which specifies the time the users logged on
- applied changes suggested for glib hash table usage
- added new link time library dependency for wtsapi32
- setting now _WIN32_WINNT to 0x0600 if not defined globally, which is Windows
  Vista and/or Windows 2008 Server and higher

*** SUBJECT HERE ***

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qga: Add 'guest-get-users' command

Changes since v2:
- Updated the documentation of login-time to be more precise what the value
  contains and what time is actually reported and in which format.

Changes since v1:
- fixed spelling issues in the commit message and schema
- added login-time field which specifies the time the users logged on
- applied changes suggested for glib hash table usage
- added new link time library dependency for wtsapi32
- setting now _WIN32_WINNT to 0x0600 if not defined globally, which is Windows
  Vista and/or Windows 2008 Server and higher

qga: Add 'guest-get-host-name' command

Since v1:
- Renamed from FQDN to hostname and expanded documentation

qga: Add 'guest-get-users' command

Changes since v1:
- fixed spelling issues in the commit message and schema
- added login-time field which specifies the time the users logged on
- applied changes suggested for glib hash table usage
- added new link time library dependency for wtsapi32
- setting now _WIN32_WINNT to 0x0600 if not defined globally, which is Windows
  Vista and/or Windows 2008 Server and higher

2.7.1

v2.8.0 release

v2.8.0-rc4 release

v2.8.0-rc3 release

v2.8.0-rc2 release