[factorio_development.sh] Make mod directory path optional for init command:

- Default to using the working directory as root.
- Bump the version, initial feature-complete release.

[factorio_development.sh] Include development script in mod directory during initialisation:

- Makes it simpler for people to use the scription without having to
fetch it from external location.

[factorio_development.sh] Use long options for git commands where available:

- Improves readability of code.

[factorio_development.sh] Added (personal) workaround for tag signing:

- Older versions of git (<2.23) do not have the tag.gpgSign
option. Try to emulate it by appending the --sign option if it is
set in git configuration.

[factorio_development.sh] Fix changelog updates and drop release archive when aborting the release:

- It is not possible to read from and update the changelog file at the
same time.

[factorio_development.sh] Added command for aborting the release process:

- Command cleans-up the local git repository from all release
artifacts.
- Pull out functions for fetching some basic information to reduce
code duplication, and refactor the exsiting code to use the helper
functions.
- Treat build configuration variables as globals.

[factorio_development.sh] Added command for releasing mods:

- Accepts mod version for the release.
- Tries to ease the process as much as possible, including updating
version numbers, tagging, and switching back to development
version.
- Include some comments in generated build configuration file.

[factorio_development.sh] Avoid switching directories within commands:

- Should make commands easily callable from within other commands.
- Avoid using the single quotes (don't -> do not) so Emacs syntax
highlighter/formatter would not get confused.

[factorio_development.sh] Added build command:

- Include default build configuration file during mod initialisation
to exclude development-specific files from the build process.
- Includes non-source files by default as well (such as README and
LICENSE).