Add initial eproc system monitor

- Add the eproc process-monitoring application and persistent window/table state
  - Implement Linux process, network, GPU, icon, and GUI-window collection
  - Add optional process columns, styling, i18n-ready strings, and command copying
  - Retain exited processes for one update and color them as ended
  - Extend table sizing and header behavior for persisted column layouts
  - Organize Linux-specific sources under platform/linux
  - Keep unsupported platforms buildable with a startup WIP warning

premake4.lua

@@ -1953,6 +1953,29 @@ solution "eepp"
 		files { "src/tools/eeiv/*.cpp" }
 		build_link_configuration( "eeiv", true )
 
+	project "eproc"
+		set_kind()
+		language "C++"
+		files {
+			"src/tools/eproc/appconfig.cpp",
+			"src/tools/eproc/eproc.cpp",
+			"src/tools/eproc/gui_window_tracker.cpp",
+			"src/tools/eproc/process_collector.cpp",
+			"src/tools/eproc/process_info.cpp",
+			"src/tools/eproc/process_model.cpp",
+		}
+		if os.is_real("linux") then
+			files {
+				"src/tools/eproc/platform/linux/gpu_reader_nvidia.cpp",
+				"src/tools/eproc/platform/linux/process_collector_linux.cpp",
+				"src/tools/eproc/platform/linux/process_icon_resolver.cpp",
+				"src/tools/eproc/platform/linux/process_network_monitor.cpp",
+			}
+			-- The Programs Only view reads window ownership from the X11 root window.
+			links { "pcap" }
+		end
+		build_link_configuration( "eproc", true )
+
 	-- Tests
 	project "eepp-test"
 		set_kind()