Support state API

[Sparky983]

Introduces Support for State

This pull request introduces support for state.

Examples

The examples have been updated to use the new features added by this PR.

Installation

You can download this pull request at:

<repositories>
    <repository>
        <id>sparky983-snapshots</id>
        <url>https://repo.sparky983.me/snapshots</url>
    </repository>
</repositories>

<dependencies>
    <dependency>
        <groupId>me.sparky983</groupId>
        <artifactId>vision-paper</artifactId>
        <version>state-SNAPSHOT</version>
    </dependency>
</dependencies>

repositories {
    maven("https://repo.sparky983.me/snapshots")
}

dependencies {
    implementation("me.sparky983:vision-paper:state-SNAPSHOT")
}

repositories {
    maven { url 'https://repo.sparky983.me/snapshots' }
}

dependencies {
    implementation 'me.sparky983:vision-paper:state-SNAPSHOT'
}

Closes #203

[Sparky983]

TODO: decide whether it is worth implementing slot(Slot, Button) and, if so, figure out its semantics

[Sparky983]

TODO: decide whether its worth waiting for https://github.com/Sparky983/state/issues/5 to be closed. if implemented it wouldn't be well supported.