remember main window position

[OSXLich-Doug]

Summary

• save the main Warlock window X/Y/width/height per connected character
• restore saved bounds after the connected character is known
• keep the existing global width/height startup fallback

Tested

• ./gradlew :desktopApp:compileKotlin -PiosSkip=true -PlintSkip=true
• ./gradlew :core:ktlintCommonMainSourceSetCheck :desktopApp:ktlintMainSourceSetCheck -PiosSkip=true -PlintSkip=true
• manually verified two characters remember different main window positions

Note: full ./gradlew check was not run locally because this environment does not have Android SDK configuration.

[sproctor]

I've changed my dev process a bit. I should document this somewhere. I'm running everything against the master branch now. Can you create a new PR to that branch?