- Improve capture buffer validation in CsrCaptureArguments(), by
implementing the checks done by Windows 2003 (NT 5.2) described
in section "Server-Side Validation and Capture" of the article
https://www.geoffchappell.com/studies/windows/win32/csrsrv/api/apireqst/capture_header.htm
- In CsrReleaseCapturedArguments(), protect the data copy back into
the client buffer within a SEH block.
Rename inaccurate names 'LocalCaptureBuffer' and 'RemoteCaptureBuffer'
into 'ClientCaptureBuffer' and 'ServerCaptureBuffer' respectively.
(Recall: CSRSRV is the 'Server', and any app doing LPC calls to it is
the 'Client'.)
Also, trigger the less fatal breakpoints only if CSRSS/CSRSRV is being
debugged (the 'BeingDebugged' flag is set in the current PEB). This will
avoid any unhandled breakpoint exceptions when testing/fuzzing running
debug builds of ReactOS without any debugger attached.