Add SteamWar CLI module

- add Clikt-based `sw` entrypoint and subcommands
- include database, user, dev, and profiler commands
- wire CLI build and CI install/release steps

CLI/src/commands/user/UserCommand.kt

@@ -0,0 +1,9 @@
+package de.steamwar.commands.user
+
+import com.github.ajalt.clikt.core.CliktCommand
+import com.github.ajalt.clikt.core.Context
+
+class UserCommand: CliktCommand("user") {
+    override fun run() = Unit
+    override fun help(context: Context): String = "User related commands"
+}