stripped obsolete features and compacted UI

1.7.0

- remove: Obsolete operators and panels
  - Remove "line closer" panel as it's been a native tool for a while in 2.9x (stop register of `GP_guided_colorize > OP_line_closer`)
  - Remove "Render" subpanel, obsolete and not adapted to production
- ui: clean and refactor
  - Gp clipboard panel and aimation Manager subpanel layout to aligned columns (gain space)
  - add `GP` on each panel name for wuick eye search
  - follow cursor now in animation manager subpanel (should be in an extra menu or removed in the end)

__init__.py

@@ -15,7 +15,7 @@ bl_info = {
 "name": "GP toolbox",
 "description": "Set of tools for Grease Pencil in animation production",
 "author": "Samuel Bernou, Christophe Seux",
-"version": (1, 6, 9),
+"version": (1, 7, 0),
 "blender": (2, 91, 0),
 "location": "Sidebar (N menu) > Gpencil > Toolbox / Gpencil properties",
 "warning": "",
@@ -43,7 +43,6 @@ from . import OP_cursor_snap_canvas
 from . import OP_palettes
 from . import OP_brushes
 from . import OP_file_checker
-from . import OP_render
 from . import OP_copy_paste
 from . import OP_realign
 from . import OP_depth_move
@@ -571,7 +570,6 @@ def register():
     OP_palettes.register()
     OP_brushes.register()
     OP_cursor_snap_canvas.register()
-    OP_render.register()
     OP_copy_paste.register()
     OP_realign.register()
     OP_depth_move.register()
@@ -612,7 +610,6 @@ def unregister():
     OP_depth_move.unregister()
     OP_realign.unregister()
     OP_copy_paste.unregister()
-    OP_render.unregister()
     OP_cursor_snap_canvas.unregister()
     OP_brushes.unregister()
     OP_palettes.unregister()