In several places in the spring-webmvc module, URL patterns / objects
relationships are kept in `HashMap`s. When matching with actual URLs,
the algorithm uses a pattern comparator to sort the matching patterns
and select the most specific. But the underlying collection
implementation does not keep the original order which can lead to
inconsistencies.

This commit changes the underlying collection implementation to
`LinkedHashmap`s, in order to keep the insert order if the comparator
does not reorder entries.

Issue: SPR-13798

Issue: SPR-13757

Issue: SPR-12926

Issue: SPR-13776

Issue: SPR-13762

Prior to this change, the resource handling FixedVersionStrategy would
be applied on all links that match the configured pattern. This is
problematic for relative links and can lead to rewritten links such as
"/fixedversion/../css/main.css" which breaks.

This commit prevents that Strategy from being applied to such links.
Of course, one should avoid to use that VersionStrategy with relative
links, but this change aims at not breaking existing links even if it
means not prefixing the version as expected.

Issue: SPR-13727

Issue: SPR-13725

Prior to this commit, range requests would be served by
ResourceHttpRequestHandler by partially reading the inputstream of
static resources. In case of resources contained in ZIP/JAR containers,
InputStreams may not fill the entire read buffer when calling
`inputStream.read(byte[])`. This was the case when using Spring Boot's
ZipInflaterInputStream - this would then not read the entire file
content and would close the response without writing the expected body
length indicated in the "Content-Length" header.

This commit makes sure that the whole resource is read.

Issue: SPR-13661

Issue: SPR-13587, SPR-13643

Issue: SPR-13654

This commit expands the range of whitelisted extensions by checking
if an extension can be resolved to image/*, audo/*, video/*, as well
as any content type that ends with +xml.

Issue: SPR-13643

We know skip the Content-Disposition header for any extension if the
chosen request mapping explicitly contains the URl extension.

Issue: SPR-13629

Prior to this change, the HttpEntityMethodProcessor would try to process
conditional requests that are undefined by the spec, such as:

* an HTTP GET request with "If-None-Match:*"
* a request with both "If-None-Match" and "If-Match"
* a request with both "If-None-Match" and "If-Unmodified-Since"

This commit skips the processing of those requests as conditional
requests and continues with normal request handling.

Issue: SPR-13626

Issue: SPR-13642

Issue: SPR-13643

Issue: SPR-13629

Issue: SPR-13611

Issue: SPR-13596

Refine the approach of having <mvc:view-resolvers> detect and use the
ContentNegotiationManager instance registered with
<mvc:annotation-driven> introduced in the last commit.

Issue: SPR-13559

The <mvc:annotation-driven> element now adds an alias when a
ContentNegotiationManager bean is registered with a custom name.
This helps <mvc:view-resolvers> to more reliably find such a custom
ContentNegotiationManager.

Issue: SPR-13559

Prior to this change, serving resources with ResourceHttpRequestHandler
could result in NPE when requesting an existing folder located in a JAR.

This commit swallows those exceptions, as it is not possible to foresee
those cases without reading the actual resource. This result in a HTTP
200 response with a zero Content-Length instead of a HTTP 500 internal
exception.

Issue: SPR-13620

Issue: SPR-13520

Issue: SPR-13505

Issue: SPR-13616

Issue: SPR-13591

Issue: SPR-13588

Issue: SPR-13548

Issue: SPR-13557

Issue: SPR-13546