Make JavaScript ignore rule better

[ChrisTorng]

Includes JSHint, JSCS, default JSCS excludeFiles, with additional
improvement with test project VSHost typing faster.

I know this must be the top priority work for you all. Must be someone working on it. I just try to contribute.

For JsHintReporter.cs, extract NotJsOrIsMinifiedOrNotExists() from ShouldIgonre(), to be use in MenuItems/JsCodeStyle.cs and JsHint.cs. I think minified js should never been JSHint/JSCS. For other default ignored js, they will still be ignore at build. But if user select them explicitly and choose to run JSHint/JSCS, we should not stop it.

For LintFileInvoker.cs, I try to stop it run on non project items. But in my debug test, I don't know why it never hit. Still commit it.

Set .jcsc.json excludeFiles to ["**/*.min.js", "**/*.debug.js", "**/*.intellisense.js", "**/*-vsdoc.js"].

For VSHost.cs, original TypeChar will init/cleanup with every single char, I change it into init/cleanup once for a whole string, improve efficiency. And according to http://www.pinvoke.net/default.aspx/Structures/VARIANTARG.html, I change 32 into 16.
This one is not related to others, I don't know whether I should commit/sync/PR this small thing alone, or just put it with other changes like this time.

[ChrisTorng]

For non-project files issue, I agree with you.

I only apply it in LintFileInvoker.RunOnAllFilesInProjectAsync().
As my inspection, RunOnAllFilesInProjectAsync() have 3 references, all from EditorExtensionsPackage.BuildEvents_OnBuildDone(), it should be called only after build.
And only run after build succeed and while WESettings.Instance.JavaScript/TypeScript.LintOnBuild == true.

For a "Run on build" request, I think what user expected is build on project referenced items, just like VS will build on all cs that been referenced, never touch other unreferenced cs inside project folder.

And I didn't stop it while open from "File - Open - File", or right click (with "Show All Files" on) to run.

Oops! While I'm checking, I see JsHintReporter.ShouldIgnore() have check for non-project items. That stops right click menu from working. But that method is shared with other callers. I cannot figure whether the checking should be removed, or it still need to be apply with some other cases.

[SLaks]

Thanks!
BTW, for the future, please put separate fixes like that in a separate commit within the same PR (for a more readable commit history)