feat(gui): port CGenericClientListCtrl to wxDataViewCtrl (#180, #801) - #850

…, amule-org#801)

Last remaining piece of amule-org#801's wxListCtrl -> wxDataViewCtrl migration:
the shared base feeding CSourceListCtrl (download sources) and
CSharedFilePeersListCtrl (shared-file peers).

Unlike every prior port, ClientCtrlItem_Struct survives rather than
being deleted: it's not a cache-avoidance wrapper, it's structurally
required, since one client (ECID) can be a source/peer of more than
one file at once, so row identity has to be the (client, owner, type)
tuple. Its dwUpdated/status fields (a 10s-TTL cached wxBitmap*) are
dropped, matching the no-cache precedent from the Shared Files and
Downloads ports -- DrawStatusBar's ColumnUserAvailable path already
shipped fully uncached.

Two bar columns, two renderers:
- ColumnUserProgress (Sources only): CSourceBarRenderer draws the
  5-state chunk bar via the base CMuleBarRenderer, except for A4AF
  rows, which get a bordered "A4AF: <filename>" text badge instead of
  a bar entirely -- a real per-row renderer branch, not an overlay.
- ColumnUserAvailable (Peers only): the plain base renderer is enough
  (2-state, no per-row branching). It has no Compare() case, matching
  pre-port behaviour where it was never sortable, so it's registered
  without wxDATAVIEW_COL_SORTABLE rather than showing a caret that
  does nothing.

The User Name column is a composite icon-cluster (status/software/
credits/ext-protocol/identified/badguy/encryption badges) plus an
optional country flag plus text -- no single-icon AddIconTextColumn()
cell can carry that. CClientNameRenderer reuses CMuleBarRenderer's
identity-carrying CBarFillSpec/GetItemBarFill() extension point to
reach the row's ClientCtrlItem_Struct and replay the whole cluster,
the same mechanism CDownloadBarRenderer uses for its CPartFile*
overlay -- registered via AddBarColumn() since it isn't a literal bar.
GetItemColumnText() still answers the plain username for this column,
so type-ahead and the accessible row label (the actual point of amule-org#180)
work off real text rather than the pre-port GetTTSText()'s hardcoded
"".

CompareItemData() replicates the original SortProc's type-precedence
pre-check (A4AF sources always sort last, direction-independent, not
just per selected column) before dispatching to the per-column
comparison.

Also: CMuleVirtualDataViewCtrl gains a GetModelRow() helper (wraps the
wxDataViewIndexListModel::GetRow() cast); CDownloadListCtrl's two
hand-rolled instances of the same cast now use it. muuli_wdr.cpp's two
construction sites for these lists drop the legacy
wxLC_REPORT|wxSUNKEN_BORDER flags (wxLC_REPORT aliases
wxDV_VARIABLE_LINE_HEIGHT), matching every other ported list.

Verified: amule and amulegui build clean from a fresh CMake configure
(wx 3.3.3); pinned clang-format v18 clean; Tier-1/Tier-2 clang-tidy
clean via the local CI replica (wx 3.2.4) -- the only Tier-1 hits are
13 pre-existing, unrelated warnings in unittests/tests/. Grepped for
every orphaned pre-port symbol (DrawClientItem, DrawSourceStatusBar,
DrawStatusBar, SortProc, dwUpdated/status) and confirmed every
external caller (TransferWnd.cpp, SharedFilesWnd.cpp, GuiEvents.cpp,
amuleDlg.cpp) still compiles unchanged against the same public API
(AddSource/RemoveSource/ShowSources/UpdateItem/SetShowing/
RemoveKnownFile). No translatable strings were added or changed, so
po/ catalogs are not regenerated.

The CGenericClientListCtrl port moved the "A4AF" badge string from
GenericClientListCtrl.cpp into SourceListCtrl.cpp (CSourceBarRenderer's
A4AF branch), shifting its extraction position in po/amule.pot and
every po/*.po. Verified symmetric: each locale loses the msgid at its
old #: comment and regains it, translation intact, at the new one --
same pattern as the prior DownloadListCtrl.cpp catalog regeneration.

Regenerated via scripts/update-po.sh.