ProjectView: replace ReloadableModule w/ ModuleRuntime

Besides, no need for unload hack to see if the module has been unloaded.
Now, MPS PluginManager is client of LanguageRegistry, like the code in ProjectViewManager, and
 load/unload notifications would get in proper order together with plugin app part events.
Before, mixing CLM code (notifications immediately on module injection into repo) with PluginManager code
 (notified with delay from LanguageRegistry) indeed lead to an improper class dispose ordering.

Author: artem-tikhomirov

code/projectview/com.mbeddr.mpsutil.projectview.runtime/com.mbeddr.mpsutil.projectview.runtime.msd

@@ -34,6 +34,7 @@
     <language slang="l:83888646-71ce-4f1c-9c53-c54016f6ad4f:jetbrains.mps.baseLanguage.collections" version="2" />
     <language slang="l:f2801650-65d5-424e-bb1b-463a8781b786:jetbrains.mps.baseLanguage.javadoc" version="3" />
     <language slang="l:760a0a8c-eabb-4521-8bfd-65db761a9ba3:jetbrains.mps.baseLanguage.logging" version="0" />
+    <language slang="l:acfc188d-d5d6-4598-b370-6f4a983f05b2:jetbrains.mps.baseLanguage.methodReferences" version="0" />
     <language slang="l:a247e09e-2435-45ba-b8d2-07e93feba96a:jetbrains.mps.baseLanguage.tuples" version="0" />
     <language slang="l:63650c59-16c8-498a-99c8-005c7ee9515d:jetbrains.mps.lang.access" version="0" />
     <language slang="l:ceab5195-25ea-4f22-9b92-103b95ca8c0c:jetbrains.mps.lang.core" version="2" />