Fix typos
SelectTag correctly detects multiple="true" again

Issue: SPR-11678
XStreamMarshaller lazily creates fallback XppDriver

Issue: SPR-11635
AbstractMarshaller pre-implements getDefaultEncoding() method

Issue: SPR-11635
Polishing

Issue: SPR-11637
Dropped JCache RC repo (now unused); minor dependency upgrades

Issue: SPR-11640
Introduce context bootstrap strategy in the TCF

This issue is a "work in progress".

 - Introduced TestContextBootstrapper strategy SPI, BootstrapContext,
   and @BootstrapWith.

 - Extracted ActiveProfilesUtils from ContextLoaderUtils.

 - Extracted ApplicationContextInitializerUtils from ContextLoaderUtils.

 - TestContextManager now delegates to TestContextBootstrapper for
   retrieving TestExecutionListeners.

 - Removed restriction in @ActiveProfiles that a custom resolver cannot
   be used with the 'value' or 'profiles' attributes.

 - Introduced DefaultActiveProfilesResolver.

 - Introduced BootstrapTestUtils.

Issue: SPR-9955