* system/MsgDialog: types & basic text display
* system/MsgDialog: User message dialog
* system/MsgDialog: RAII for MsgDialog ui
* system/MsgDialog: Progress bar dialog
* system/MsgDialog: System message texts
* system/MsgDialog: copy all ui state to local memory
handles when game release memory before close
extracted all UI code to it's own file
use single window instead of creating new one every single dialogOpen
* system/MsgDialog: debug logging
* added imgui as dependency
* imgui renderer/basic input implementation
* imgui: add layers system
Add video info layer to show fps. Press F10 to toggle it.
* imgui: add custom imgui config
* imgui: gamepad capture, stopping propagation
* imgui: changed config & log file path to use portable dir
* videoout: render blank frame when video output is closed
required to render imgui even when game has no video output
- fixed merge compile-error
