Feedback to improve compileOnSave with tsserver.

I have implemented inside Eclipse compile on save with tsserver by consuming compileOnSaveAffectedFileList and compileOnSaveEmitFile commands. It works great but I think we could again improved it

For compileOnSaveAffectedFileList:

• compileOnSaveAffectedFileList should throw error when the given file is excluded of tsconfig.json. It will give the capability to display an error dialog when user wishes to compile a ts file which is excluded by tsconfig.json
• in some case, tsserver compileOnSaveAffectedFileList returns *.d.ts files (see ttps://github.com/angelozerr/typescript.java/issues/190#issuecomment-317876026) those *.d.ts files must be ignored for compilation.

For compileOnSaveEmitFile:

• the reponse compileOnSaveEmitFile should return diagnostics errors. I had to call the two tsserver commands syntacticDiagnosticsSync and semantacticDiagnosticsSync after the call of compileOnSaveEmitFile to display errors in the Eclipse "Problem View"
• the reponse compileOnSaveEmitFile should return the emited files path (js and *.js.map). In Eclipse case it's very helpful because I could refresh the files.

Inizia dagli entry point di tsserver per compileOnSaveAffectedFileList e compileOnSaveEmitFile, quindi esamina i comandi correlati syntacticDiagnosticsSync e semantacticDiagnosticsSync. Il lavoro è completato quando i file esclusi producono un errore, i file di dichiarazione vengono ignorati e compileOnSaveEmitFile segnala i diagnostici oltre ai percorsi dei file JavaScript e source-map emessi.