SelectTag correctly detects multiple="true" again

Issue: SPR-11678
(cherry picked from commit 8d8766d)
XStreamMarshaller lazily creates fallback XppDriver

Issue: SPR-11635
(cherry picked from commit 8f28a93)
AbstractMarshaller pre-implements getDefaultEncoding() method

Issue: SPR-11635
(cherry picked from commit d4b0ae9)
Polishing

Issue: SPR-11637
(cherry picked from commit 0041e24)
Dropped JCache RC repo (now unused); minor dependency upgrades

Issue: SPR-11640
(cherry picked from commit 9e1631d)