Build all dependencies for umu clients (#143)

* Build all Python modules for umu clients

- The Makefile currently builds python-xlib and the client is responsible for putting the module within their runtime directory. However, python-xlib depends on six.py and this will not get built for umu clients. To properly build dependencies, we need to use pip to resolve all of the dependencies and have them put in the object directory during the build process.

* Update README.md

* Add note on how to install dependencies

* Update info statements

Makefile.in

@@ -125,18 +125,19 @@ umu-launcher-dist-install:
 umu-launcher-install: umu-launcher-dist-install umu-launcher-bin-install
 
 
-$(OBJDIR)/.build-python-xlib: | $(OBJDIR)
-	$(info :: Building python-xlib )
-	cd subprojects/python-xlib && \
-	$(PYTHON_INTERPRETER) setup.py build
+$(OBJDIR)/.build-umu-subprojects: | $(OBJDIR)
+	$(info :: Building subprojects )
+	pip install -r requirements.in -t $(OBJDIR)
 
-.PHONY: python-xlib
-python-xlib: $(OBJDIR)/.build-python-xlib
+.PHONY: umu-subprojects
+umu-subprojects: $(OBJDIR)/.build-umu-subprojects
 
-python-xlib-install:
-	$(info :: Installing python-xlib )
+umu-subprojects-install:
+	$(info :: Installing subprojects )
 	install -d $(DESTDIR)$(PYTHONDIR)
-	cp      -r subprojects/python-xlib/build/lib/Xlib $(DESTDIR)$(PYTHONDIR)
+	cp      -r $(OBJDIR)/*-info $(DESTDIR)$(PYTHONDIR)
+	cp      -r $(OBJDIR)/Xlib   $(DESTDIR)$(PYTHONDIR)
+	cp         $(OBJDIR)/six.py $(DESTDIR)$(PYTHONDIR)
 
 $(OBJDIR):
 	@mkdir -p $(@)

README.md

@@ -92,6 +92,13 @@ Change the `--prefix` as fit for your distribution, for example `/usr/local`, or
 
 Then run `make` to build. After a successful build the resulting files should be available in the `./builddir` directory
 
+**Note**: For umu clients, [pip](https://github.com/pypa/pip) is required to build its Python dependencies and they will need to be put within same directory as the runtime directory (e.g., `$HOME/.config/heroic/tools/runtimes/umu`).
+
+To build all dependencies:
+```shell
+make DESTDIR=<packaging_directory> umu-subprojects
+```
+
 ### Installing 
 To install umu-launcher run the following command after completing the steps described above
 ```shell
@@ -102,6 +109,11 @@ or if you are packaging umu-launcher
 make DESTDIR=<packaging_directory> install
 ```
 
+**Note**: For umu clients, to install all of its dependencies, run:
+```shell
+make DESTDIR=<packaging_directory> umu-subprojects-install
+```
+
 ### Installing as user
 If you want to install umu just for your user, or for quickly testing, you can configure umu with the following command
 ```shell