Add dmg building on MacOS, move build-related stuff to deploy/

Makefile

@@ -5,6 +5,7 @@ PY_FILES = $(wildcard *.py) $(wildcard gui/*.py)
 UI_COMPILED = $(UI_FILES:.ui=.py)
 TS_COMPILED = $(TS_FILES:.ts=.qm)
 
+# python3.6 on Windows is only available as python.exe
 ifeq (, $(shell which python3))
 PY ?= python
 else
@@ -26,13 +27,26 @@ clean:
 run: all
 	$(PY) luftdaten-tool.py
 
-dist: all
-	$(PY) -m PyInstaller -y luftdaten-tool.spec
+# Updates all translation files in i18n/ directory
+i18n-update: $(UI_COMPILED)
+	@for f in $(TS_FILES) ; do \
+		pylupdate5 $(PY_FILES) -ts $$f -verbose; \
+	done
 
 deps:
 	$(PY) -m pip install -U -r requirements.txt
 
-i18n-update:
-	@for f in $(TS_FILES) ; do \
-		pylupdate5 *.py gui/*.py -ts $$f -verbose; \
-	done
+# Here go platform-specific buildsteps
+UNAME_S := $(shell uname -s)
+
+ifeq ($(UNAME_S),Darwin)
+PLATFORM_DEPS := assets/logo.icns
+assets/logo.icns: assets/logo.png
+	deploy/mkicns $<
+endif
+
+dist: all $(PLATFORM_DEPS)
+	$(PY) -m PyInstaller -y luftdaten-tool.spec
+
+dmg: dist
+	dmgbuild -s deploy/dmgbuild_settings.py -D app=dist/Luftdaten.info\ Flashing\ Tool.app "Luftdaten.info Flashing Tool" dist/luftdaten-tool.dmg