Move egui_plot to its own repo (#4828)

* Part of https://github.com/emilk/egui/issues/4705

`egui_plot` can now be found at https://github.com/emilk/egui_plot

Cargo.lock

@@ -1059,15 +1059,6 @@ dependencies = [
  "env_logger",
 ]
 
-[[package]]
-name = "custom_plot_manipulation"
-version = "0.1.0"
-dependencies = [
- "eframe",
- "egui_plot",
- "env_logger",
-]
-
 [[package]]
 name = "custom_window_frame"
 version = "0.1.0"
@@ -1302,7 +1293,6 @@ dependencies = [
  "document-features",
  "egui",
  "egui_extras",
- "egui_plot",
  "log",
  "serde",
  "unicode_names2",
@@ -1348,17 +1338,6 @@ dependencies = [
  "winit",
 ]
 
-[[package]]
-name = "egui_plot"
-version = "0.28.1"
-dependencies = [
- "ahash",
- "document-features",
- "egui",
- "emath",
- "serde",
-]
-
 [[package]]
 name = "ehttp"
 version = "0.5.0"
@@ -3288,17 +3267,6 @@ dependencies = [
  "winapi-util",
 ]
 
-[[package]]
-name = "save_plot"
-version = "0.1.0"
-dependencies = [
- "eframe",
- "egui_plot",
- "env_logger",
- "image",
- "rfd",
-]
-
 [[package]]
 name = "scoped-tls"
 version = "1.0.1"