Memory (project) leak in plugin

[VladRassokhin]

After all project closed in IDEA 2018.3.2 with PowerShell plugin v2.0.0 there's strong-referenceable ProjectImpl present in memory. Here's paths from GC roots:

  +---com.intellij.openapi.project.impl.ProjectImpl                                                                                              
    +---key of java.util.LinkedHashMap$Entry (ProjectImpl → LanguageServerEndpoint) chunk size = 1                                                  
      +---head of java.util.LinkedHashMap size = 1                                                                                                  
        +---psEditorLanguageServer of com.intellij.plugin.powershell.lang.lsp.LSPInitMain com.intellij.ide.plugins.cl.PluginClassLoader (112)                                              
          +---<class> of com.intellij.plugin.powershell.lang.lsp.LSPInitMain                                                                        
            +---[36] of java.lang.Object[79]                                                                                                        
              +---_values of gnu.trove.THashMap size = 58                                                                                           
                +---myNameToComponent of com.intellij.openapi.application.impl.ApplicationImpl [Stack Local] 
                  +---<local variable> of java.lang.Thread [JNI Global, Thread, Stack Local] "Periodic tasks thread" daemon tid=26 [TIMED_WAITING]