Here is a list of all files with brief descriptions:

common
engine
audio.cpp
audio.h
colors.h
easings.h
env.cpp
env.h
gamepad.cpp
gamepad.h
map.cpp
map.h
map_io.cpp
mapobjects.h
mapobjects_eq.h
postfx.h
renderer.cpp
renderer.h
renderer_config.cpp
tags.cpp
tags.h
workerpool.cpp
workerpool.h
editor
editor.cpp
editor.h
globals.h
main.cpp
mainwindow.cpp
mainwindow.h
renderwindow.cpp
renderwindow.h
walker.cpp
walker.h
wdgmapeditor.cpp
wdgmapeditor.h
wdgmapview.cpp
wdgmapview.h
wdgtexselector.cpp
wdgtexselector.h
wdgtexview.cpp
wdgtexview.h