* ldc2 support
the pragma versions passed to the compiler need an additional `-d`
prefix in case of ldc2. Add it if the compiler component looks like
ldc2.
* pkg-config support
By passing `PKGCONFIG=1` to the make call libraries are searched via
`pkg-config` instead of hard-coded values.
* add external sources for (d)notify with README and license statements
* add new logAndNotify function, make building a compile time option
* use logAndNotify and main.d, make timeout message silent
* update documentation for notification support
* add command line switch --disable-notifications
* add build-deps for libnotify in README.md
* install documentation files into $PREFIX/share/doc/onedrive/
* add man page and install it, ignore generated version
* remove installed doc/man on uninstall
* remove generated man page on make clean
`make uninstall` is called by root user, which shouldn't be a primary user anyway,, so removing ~/.config/onedrive will not work for other, normal users.
* Change the ordering of 'make install' so that directories and
permissions are set first
* Use wildcard to copy service files to systemd directory as 'install'
was failing when there was @ in the script
* Update systemd units files based on
https://www.freedesktop.org/wiki/Software/systemd/NetworkTarget/ for
starting the onedrive service
* Include the user onedrive service file in makefile & spec
* Ensure that when 'make install' is done, the logfile path is created
with correct permissions
* Ensure that when RPM package is installed, the logfile path is created
with correct permissions
When the dir the file is being installed to doesn't exist (like when setting DESTDIR), "install" will take the last part as the filename. A file called "/usr/lib/systemd/user" doesn't work correctly.
When installed the *onedrive.conf* file content was copied to the **file** /usr/local/etc, instead of creating the **missing** directory etc/ and then copying inside the file *onedrive.conf*.
