Support multiple projects simultaneously

[BFergerson]

fixes: sourceplusplus/sourceplusplus#475

[MrMineO5]

java.lang.reflect.InvocationTargetException
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480)
	at liveplugin.implementation.pluginrunner.kotlin.KotlinPluginRunner.run(KotlinPluginRunner.kt:101)
	at liveplugin.implementation.actions.RunPluginActionsKt$runWith$1$1.invoke(RunPluginActions.kt:113)
	at liveplugin.implementation.actions.RunPluginActionsKt$runWith$1$1.invoke(RunPluginActions.kt:113)
	at liveplugin.implementation.common.IdeUtil.runOnEdt$lambda-2(ide-util.kt:84)
	at com.intellij.openapi.application.TransactionGuardImpl.runWithWritingAllowed(TransactionGuardImpl.java:209)
	at com.intellij.openapi.application.TransactionGuardImpl.access$100(TransactionGuardImpl.java:21)
	at com.intellij.openapi.application.TransactionGuardImpl$1.run(TransactionGuardImpl.java:191)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:881)
	at com.intellij.openapi.application.impl.ApplicationImpl$3.run(ApplicationImpl.java:513)
	at com.intellij.openapi.application.impl.LaterInvocator$1.run(LaterInvocator.java:95)
	at com.intellij.openapi.application.impl.FlushQueue.doRun(FlushQueue.java:75)
	at com.intellij.openapi.application.impl.FlushQueue.runNextEvent(FlushQueue.java:118)
	at com.intellij.openapi.application.impl.FlushQueue.flushNow(FlushQueue.java:42)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:779)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:730)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:724)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:749)
	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:898)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:746)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$6(IdeEventQueue.java:439)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:791)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$7(IdeEventQueue.java:438)
	at com.intellij.openapi.application.TransactionGuardImpl.performActivity(TransactionGuardImpl.java:105)
	at com.intellij.ide.IdeEventQueue.performActivity(IdeEventQueue.java:604)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$8(IdeEventQueue.java:436)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:881)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:484)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:207)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:92)
Caused by: com.intellij.util.IncorrectOperationException: Sorry but parent: LivePlugin: LivePlugin(path=C:/Users/~/AppData/Local/Temp/spp-resources6190580091324028157/.spp/plugins/slow-endpoint) (class liveplugin.implementation.actions.RunPluginActionsKt$create$disposable$1) has already been disposed (see the cause for stacktrace) so the child: spp.plugin.DisposableKt$$Lambda$11607/0x000000010597e900@473fd93b (class spp.plugin.DisposableKt$$Lambda$11607/0x000000010597e900) will never be disposed
	at com.intellij.openapi.util.ObjectTree.register(ObjectTree.java:43)
	at com.intellij.openapi.util.Disposer.register(Disposer.java:117)
	at spp.plugin.DisposableKt.whenDisposed(disposable.kt:8)
	at spp.plugin.Live_plugin_centerKt.registerIndicator(live-plugin-center.kt:34)
	at Plugin.<init>(plugin.kts:144)	... 41 more

Many errors similar to this one with different things after .spp/plugins appear when the plugin reconnects to the platform

[BFergerson]

@MrMineO5, still a couple of things to do but the above issue should be solved. Please give it another try.