refact: remove almost all files

This is a prepare commit for the following refactor of
dde-application-manager.

I remove almost all files in this git repository.

We will start the refactor in later commits.

Signed-off-by: black-desk <me@black-desk.cn>

misc/CMakeLists.txt

@@ -1,2 +0,0 @@
-add_subdirectory(systemd)
-add_subdirectory(dconf)