use opaque pointers for ImGuiContext

utf-8 support

AddFontFromMemoryTTF needs a native copy of the data

use optional_override instead of select_overload for lambda functions

fix indentation

change strcpy to strncpy

more font support; add fonts to style editor in demo

use raw pointer for ImGuiContext

move and rename all static globals

label reference get/set functions

remove some unused raw pointers

use references for ImGuiTextEditCallbackData and ImGuiSizeCallbackData

remove constructors for ImVec2 and ImVec4

import float where Number.MAX_VALUE might be used

initial Drag/Drop support

ImFontAtlas::GetTexDataAsAlpha8 is 1 byte per pixel

bind more of ImGuiIO

fix ImDrawList::AddTriangleFilled

add ImDrawList::AddPolyline and AddConvexPolyFilled

add ImGui::SetAllocatorFunctions

add ImGui::VSliderScalar

add and check ImGui::DebugCheckVersionAndDataLayout

overload ImDrawList::AddText; handle text_end; return remaining from CalcTextSizeA

add reference color to ColorPicker4

more function overloading

function overloading for RadioButton, PlotLines, PlotHistogram and Combo

add ImGui::Combo with callback

use macro for import/export string_or_null

additional font support; import/export floats and nullable strings

multiple font support