Also updates fabric loader.

The [old page](https://fabricmc.net/versions.html) is missing links to the online javadocs. It tells users to use the [new page](https://fabricmc.net/develop) instead, so we might as well provide the new one here to begin with.

Using JAVA_17 is currently broken with the production server and not necessarily indicated by how Mixin treats this field

* Update yarn and fabric load/api

To keep up to date with https://fabricmc.net/versions.html?&version=1.17.1

* Set loader to latest stable version

This commit can be used as an example on how to update your mod to Java 16. You will need to ensure you have Java 16 installed and set as the active version to run this.

Gradle 7 is required along with loom 0.8

Co-authored-by: ByMartrixX <47987888+ByMartrixx@users.noreply.github.com>

* Update build.gradle

* Implements @liach's suggested changes

* Update build.gradle
Co-authored-by: Juuxel <6596629+Juuxel@users.noreply.github.com>

* Update build.gradle
Co-authored-by: Juuxel <6596629+Juuxel@users.noreply.github.com>

* Update build.gradle

* Update build.gradle
Co-authored-by: Juuxel <6596629+Juuxel@users.noreply.github.com>

Closes #78

This should have never been here, sadly not a lot I can do about the past.

* Modernize gradle buildscript

* Bump yarn/loader/fabric api versions

* Add GH actions to build example mod

* Update in response to feedback

* Ignore commonly generated Mac OS junk files

This is optional, but it would be a huge quality of life improvement for anyone developing on Mac OS, as the first thing I do when starting a new project is always to add this to the .gitignore. Example: Just from the small changes I've made to the build script alone, I've generated 4 .DS_Store files, which would clutter up this PR if I included them.

* Simply processResources logic & make it compatible with future versions of Gradle

When the processResources task is currently run, it uses deprecated Gradle features. Running "gradle clean build --warning-mode all" should output a message along the lines of "Copying or archiving duplicate paths with the default duplicates strategy has been deprecated. This is scheduled to be removed in Gradle 7.0.". This is due to inlcuding all files twice, as the "from" blocks includes them for the second time (gradle includes these files by default). This PR simply edits the relevant files from the already selected resources directory. This also reduces the amount of repetition in the script.

* Switch to double quotes to match style

D'oh!