Summary:
Add detecting and blocking in-source builds
A simple cmake function, which detects if the source and build dir are
one and the same. This unfortunately does not catch the case when the
build dir is inside the source dir, since we actually want to support
that. For example, creating a 'build' directory inside the project
source directory should be allowed.
Add a clean_all custom target in cmake
This target will clean all the files inside the build directory. It
should be used with care!
A new cmake module is created, since invoking cmake -E remove_directory
will delete the directory and we want to keep it. This way, we also
avoid using platform specific shell command, i.e `rm -rf` and we can
make clean_all smarter in the future.
Untrack build/.gitignore from git
Reviewers: buda
Reviewed By: buda
Subscribers: pullbot
Differential Revision: https://phabricator.memgraph.io/D92
