Static files rework

Currently, you configure static files like this:

public JavalinConfig addStaticFiles(String classpathPath)
public JavalinConfig addStaticFiles(String path, Location location)
public JavalinConfig addStaticFiles(String urlPathPrefix, String path, Location location)

In addition you have some global properties:

public boolean precompressStaticFiles = false;
public ContextHandler.AliasCheck aliasCheckForStaticFiles = null;

And in addition to that (!), you have that files served from a dir called /immutable have the max-axe header set to 1 year.

It should be possible to clean this up a bit.

[tipsy]

There was a suggestion on Discord to add static file handlers as normal get routes:

get(path, staticFilesHandler, roles)

[tipsy]

Current API:

javalin.addStaticFiles { staticFiles ->
    staticFiles.hostedPath = "/url-prefix"
    staticFiles.directory = "/public"
    staticFiles.location = Location.CLASSPATH
    staticFiles.aliasCheck = ContextHandler.ApproveAliases()
    staticFiles.precompress = true
    staticFiles.headers = mapOf(Header.CACHE_CONTROL to "max-age=31622400")
}