Instater

- Add support for python3.12

- Automatically convert int/float from templated variables, instead of being strings
- `become` the `makepkg` user for running `yay` (hardcoded for now)

- Add `pacman_bootstrapped_packages` option to ignore certain packages from the
manually installed checks
- Add `--quiet` or `-q` flag which does not print any information for skipped
tasks

- Fix `instater_dir` template variable to be a proper absolute path
(previously, relative paths could appear like `/path/to/cwd/../another_dir/setup.yml`)
- Add `--explain` flag to show reasoning for each changed/skipped task
- Do not run the pacman package comparison when specifying `--tags`,
since in that situation the comparison is not complete

- Add `fetch_tags` argument to `git` task

- Add check for manually installed pacman packages when using Arch Linux
- Add `--skip-tasks` argument to skip all tasks (useful for the pacman
package check)
- Fix bug where relative paths were not resolving when instater was run
from a directory other than the one containing the setup.yml file