use string instead of const char* (Config.SettingFile)

add api to get view region

after 1.89.4, need to add IMGUI_DEFINE_MATH_OPERATORS before imgui.h

add a image layer on top of c_UserChannel_Grid, but below c_UserChannel_Hints

in imgui later version, key definitions are changed

Add IMGUI_NODE_EDITOR_VERSION and IMGUI_NODE_EDITOR_VERSION_NUM.

Natvis: Add crude_json::value visualization

Editor: Don't relay on ImGui CursorMaxPos to apply padding (https://github.com/ocornut/imgui/issues/5548)

Editor: Cycle canvas to correctly restore view on first frame (#159)

Editor: Add canvas size mode (#170)

Editor: Delete item from internal list only when action accepts (#178)

Editor: Don't steal input from active user widget (#172)

Application: Recreate DX11 resources lazily (related to #162)

Application: Correctly set DX11 View for NULL textures (#162)

Editor: Add highlighting of Links connected to selected Node (#175) (fixup)