[Feature Request]: Add an update checker

[Qubik65536]

Please choose if applies:

• I'm currently working on a adding this feature.

Describe the solution you'd like

Add an update checker (based on the GitHub tag) and notify the user when the application is starting and on the home and about pages.

Describe alternatives you've considered

No response

Anything else?

• The /about page requested in [Feature Request]: Add an /about page #10 should be added first.

Please accept these terms

• I have searched the existing issues and this has not been posted before

[Qubik65536]

Check logic:

fun compareVersion (
  currentVersion: String = "0.0.0",
  currentStage: String = "stable",
  comparedVersion: String = "0.0.0",
  comparedStage: String = "stable"
) -> Int {
  /**
   * return -1 if the current version is newer (not released dev)
   * return 0 if the current version is same as newest
   * return 1 if the current version is older
   */
   /*...*/
}

val currentReleaseVersion = VersionUtil.getVersion()
val currentReleaseStage = VersionUtil.getProperty("stage")

if (stage == "stable") {
  val client = HttpClient(CIO)
  val response = try {
    client.get("https://api.github.com/repos/iXORTech/RemoteMC-Core/releases/latest") {
      method = HttpMethod.Get
    }.body<String>().toString() 
  } catch (e: ConnectException) {
    /*...*/
  }
  /*...*/
  val latestReleaseVersion = /*...*/
  compareVersion(
    currentVersion = currentReleaseVersion,
    comparedVersion = latestReleaseVersion
  )
} else if (stage.contains("dev") || stage.contains("alpha") || stage.contains("beta") || stage.contains("rc")) {
  val client = HttpClient(CIO)
  val response = try {
    client.get("https://api.github.com/repos/iXORTech/RemoteMC-Core/tags") {
      method = HttpMethod.Get
    }.body<String>().toString() 
  } catch (e: ConnectException) {
    /*...*/
  }
  /*...*/
  val latestReleaseVersion = /*...*/
  val latestReleaseStage = /*...*/
  compareVersion(
    currentVersion = currentReleaseVersion,
    currentStage = currentReleaseStage,
    comparedVersion = latestReleaseVersion,
    comparedStage = latestReleaseStage
  )
} else { /*...*/ }