Merge branch '72-imgui-support' into 'develop'

.gitignore

.gitmodules

CMakeLists.txt

config/Sources.cmake

include/vkcv/Core.hpp

include/vkcv/Event.hpp

include/vkcv/Image.hpp

include/vkcv/Swapchain.hpp

include/vkcv/Window.hpp

modules/CMakeLists.txt

modules/camera/include/vkcv/camera/CameraManager.hpp

modules/camera/src/vkcv/camera/CameraManager.cpp

modules/gui/CMakeLists.txt

modules/gui/config/ImGui.cmake

modules/gui/include/vkcv/gui/GUI.hpp

modules/gui/lib/imgui

modules/gui/src/vkcv/gui/GUI.cpp

modules/shader_compiler/src/vkcv/shader/GLSLCompiler.cpp

projects/cmd_sync_test/src/main.cpp

projects/first_mesh/src/main.cpp