[Installer] Make the Inno Setup installer the default, with its failure hook.

COCKATRICE_WIN_INSTALLER now defaults to InnoSetup. NSIS stays selectable for
one release as the legacy fallback, and the two can still be built from one
tree and compared on a real upgrade.

The switches question from the previous commit is settled from Inno Setup's
source: the setup command line is an if/else-if chain over the switches it
knows, with no fallback that rejects the rest, so /R, /PID= and /D= are
ignored rather than refused. The client therefore sends one command line that
drives either installer:

- /R and /PID= for NSIS, which also needs /D= last and unquoted;
- /VERYSILENT and the CloseApplications set for Setup, which releases the
  mapped runtime DLLs through Restart Manager instead of waiting for a pid;
- /UPDATER as the client's own mark, read only by the Inno Setup script.

An older client that passes only the NSIS switches still installs; it walks
the wizard once instead of running silently.

The Sentry offer that AbortInstall carried is ported: a silent run the updater
launched, which began replacing files and never reached the end, offers to
send its log through the same helper. The helper is embedded with a [Files]
dontcopy entry and extracted at send time; a repeated [Files] section merges
with the generated one instead of being a compile error. Setup prefixes every
log line with a timestamp, so the helper's ABORT scan now allows that prefix.

CI installs Inno Setup next to NSIS, dumps ISCCOutput.log and the generated
script when the installer fails to compile, and --package NSIS|InnoSetup
selects the installer through the CMake option instead of adding a second
CPack generator to the run.

.ci/compile.sh

@@ -194,7 +194,14 @@ if [[ $USE_CCACHE ]]; then
   fi
 fi
 if [[ $PACKAGE_TYPE ]]; then
-  flags+=("-DCPACK_GENERATOR=$PACKAGE_TYPE")
+  if [[ $PACKAGE_TYPE == NSIS || $PACKAGE_TYPE == InnoSetup ]]; then
+    # The Windows installer is chosen by a CMake option, and that option then adds its CPack
+    # generator itself. Passing CPACK_GENERATOR as well would list both installers and build
+    # both in one run.
+    flags+=("-DCOCKATRICE_WIN_INSTALLER=$PACKAGE_TYPE")
+  else
+    flags+=("-DCPACK_GENERATOR=$PACKAGE_TYPE")
+  fi
 fi
 if [[ $USE_VCPKG ]]; then
   flags+=("-DUSE_VCPKG=1")