Update .gitlab-ci.yml

Change color of suppressed rule display

Revert "Change color of suppressed rule display"

This reverts commit 28e342e5ecbf914f04cca166781872e740d741de.

Attempt #2 at fixing gitlab

Attempt at fixing gitlab build #3: damn symlinks

Add back runner tags

Fix permissions for bash script

Attempt to fix the segfaults that showed up

Fix escape codes and a syntax error in the for-loops

Add a line feed to `do` so that Bash stops whining

Update ci/cppcheck.sh

Fix segfaults, attempt #2

Update cppcheck to version 1.86-1

Fix the for loops

Add `helit` tag to run on local CI

- Used a docker image with a more recent version of Debian
- Enabled colours for gcc and clang
- Updated clang-tidy from 4.0 to 7.0
- Enabled some diagnostic checks for clang-tidy, and disabled others that gave false positives
- Made clang-tidy read system header files, while ignoring their errors

- Fixed clang-tidy version
- Moved CI to separate .sh files

Add CI files
Add code style configuration for CLion