KSMServer: improve suspend code

1. Some code deduplication. Suspending is now handled via the public method `suspend(int)` which is DCOP-accessible and maps SuspendType values to corresponding TDEHWLib TDESystemPowerState values, and the internal method `suspendInternal(int)` which performs the chosen suspend and optionally locks the screen beforehand.
2. Options are now read from power-managerrc on startup and stored in memory to avoid reading the configuration file every time a suspend is requested.
3. SuspendType is now a member of KSMServer class (instead of KSMShutdownDlg)
4. A new DCOP-accessible method `suspendOptions()` returns a TQStringList of all available suspend options.

Signed-off-by: Mavridis Philippe <mavridisf@gmail.com>
(cherry picked from commit d88718ee027e329565d2d97c5cadde4aa1b83166)

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