[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).

[factorio_development.sh] Added initial implementation of Factorio mod development tool:

- Include basic script structure.
- Implement initialisation command for a new mod.

[TEMPLATE.sh.tpl] Switch to using upper-case names for global variables:

- Makes it easier to differntiate local variables in functions.
- Allows for avoiding "shadowing" of lower-cased/upper-cased variable
names by mistake in functions.

[factorio_manager.sh] Drop sleeps between instance launching when looping:

- For development purposes it is better to relaunch straight away to
reload things like prototype definitions, settings, and localisation
strings (for faster feedback).
- Even with 2-second delay, chances are that the user will miss to
actually get to terminal on time, and making it longer makes it more
annoying when developing mods.

[factorio_manager.sh] Added Bash completion for the script:

- Completion code is kept inline within the script itself, making it
easy to automatically generate it and include in Bash startup files.

[factorio_manager.sh] Added command for repeatedly launching an instance:

- Very helpful when developing mods that modify prototypes and require
instance restarts to make the changes visible.