build: split the engine into liboakengine.so; worker drops the UI entirely

Physical split: app/{audio,cli,codec,common,config,node,pluginSupport,
render,task,timeline,undo,tool,shaders} plus coreengine, version and
ui/icons+colorcoding move to a new top-level engine/ tree, built as
liboakengine.so (shared). The render backends (oakgl/oakvulkan) move
with it and link the engine library instead of embedding a static
render-core subset (libolive-rendercore is gone).

- oak-render-worker now links liboakengine instead of the whole
  libolive-editor object set: 336MB -> 2.9MB, no Qt Widgets UI
- the editor links liboakengine for the engine and keeps only UI
  objects in libolive-editor
- install/packaging: GNUInstallDirs libdir on Linux, bundle copy on
  macOS, oakengine.dll staged for NSIS, AppImage validation entry
- fix backend lookup for the new layout: DynamicRenderer searched
  ../app but backends now live in engine/; a stale pre-split liboakgl
  in the build tree got dlopened instead, re-initialized and later
  destroyed the interposed engine statics (full-suite segfault at
  DialogSequenceParameterTab, found via gdb watchpoint)

engine/node/distort/wave/wavedistortnode.cpp

@@ -0,0 +1,106 @@
+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2022 Olive Team
+  Modifications Copyright (C) 2025 mikesolar
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+***/
+
+#include "wavedistortnode.h"
+
+namespace olive
+{
+
+const QString WaveDistortNode::k_texture_input = QStringLiteral("tex_in");
+const QString WaveDistortNode::k_frequency_input = QStringLiteral("frequency_in");
+const QString WaveDistortNode::k_intensity_input = QStringLiteral("intensity_in");
+const QString WaveDistortNode::k_evolution_input = QStringLiteral("evolution_in");
+const QString WaveDistortNode::k_vertical_input = QStringLiteral("vertical_in");
+
+#define super Node
+
+WaveDistortNode::WaveDistortNode()
+{
+	add_input(k_texture_input, NodeValue::k_texture,
+			 InputFlags(k_input_flag_not_keyframable));
+
+	add_input(k_frequency_input, NodeValue::k_float, 10);
+	add_input(k_intensity_input, NodeValue::k_float, 10);
+	add_input(k_evolution_input, NodeValue::k_float, 0);
+
+	add_input(k_vertical_input, NodeValue::k_combo, false);
+
+	set_flag(k_video_effect);
+	set_effect_input(k_texture_input);
+}
+
+QString WaveDistortNode::name() const
+{
+	return tr("Wave");
+}
+
+QString WaveDistortNode::id() const
+{
+	return QStringLiteral("org.olivevideoeditor.Olive.wave");
+}
+
+QVector<Node::CategoryID> WaveDistortNode::category() const
+{
+	return { k_category_distort };
+}
+
+QString WaveDistortNode::description() const
+{
+	return tr("Distorts an image along a sine wave.");
+}
+
+void WaveDistortNode::retranslate()
+{
+	super::retranslate();
+
+	set_input_name(k_texture_input, tr("Input"));
+	set_input_name(k_frequency_input, tr("Frequency"));
+	set_input_name(k_intensity_input, tr("Intensity"));
+	set_input_name(k_evolution_input, tr("Evolution"));
+	set_input_name(k_vertical_input, tr("Direction"));
+	set_combo_box_strings(k_vertical_input, { tr("Horizontal"), tr("Vertical") });
+}
+
+ShaderCode WaveDistortNode::get_shader_code(const ShaderRequest &request) const
+{
+	Q_UNUSED(request)
+	return ShaderCode(FileFunctions::read_file_as_string(":/shaders/wave.frag"));
+}
+
+void WaveDistortNode::value(const NodeValueRow &value,
+							const NodeGlobals &globals,
+							NodeValueTable *table) const
+{
+	// If there's no texture, no need to run an operation
+	if (TexturePtr texture = value[k_texture_input].to_texture()) {
+		// Only run shader if at least one of flip or flop are selected
+		if (!qIsNull(value[k_intensity_input].to_double())) {
+			table->push(NodeValue::k_texture,
+						Texture::job(texture->params(), ShaderJob(value)),
+						this);
+		} else {
+			// If we're not flipping or flopping just push the texture
+			table->push(value[k_texture_input]);
+		}
+	}
+}
+
+}