Refactor AnalysisFlags and their support in IDE

* Support flags with any value (not just Boolean)
* Support all flags by parsing arguments in KotlinFacetSettings, instead
  of manually listing known flags

 #KT-19210 Fixed

js/js.frontend/src/org/jetbrains/kotlin/js/config/JsConfig.java

@@ -163,8 +163,7 @@ public class JsConfig {
 
         Set<String> modules = new HashSet<>();
 
-        boolean skipMetadataVersionCheck =
-                getLanguageVersionSettings(configuration).isFlagEnabled(AnalysisFlags.getSkipMetadataVersionCheck());
+        boolean skipMetadataVersionCheck = getLanguageVersionSettings(configuration).getFlag(AnalysisFlag.getSkipMetadataVersionCheck());
 
         for (String path : libraries) {
             if (librariesToSkip != null && librariesToSkip.contains(path)) continue;
@@ -312,7 +311,7 @@ public class JsConfig {
         return factoryMap.computeIfAbsent(metadata, m -> {
             LanguageVersionSettings languageVersionSettings = CommonConfigurationKeysKt.getLanguageVersionSettings(configuration);
             assert m.getVersion().isCompatible() ||
-                   languageVersionSettings.isFlagEnabled(AnalysisFlags.getSkipMetadataVersionCheck()) :
+                   languageVersionSettings.getFlag(AnalysisFlag.getSkipMetadataVersionCheck()) :
                     "Expected JS metadata version " + JsMetadataVersion.INSTANCE + ", but actual metadata version is " + m.getVersion();
 
             ModuleDescriptorImpl moduleDescriptor = new ModuleDescriptorImpl(