HIPPLUG-1177: in demo project, configure the titles of second taxonomy picker with a translator and the "captionKey" property, also just "caption" on the canontextpage type

HIPPLUG-1179: prepare branch taxonomy-demo-2.0.x

CMS7-9450: Switch to using semantic versioning for all CMS 10 modules
- old version x.y.z => (x+1).0.0
- bumped to latest project or release parent pom
- also updated copyright year where needed
- cleaned up/moved dependency version properties to main pom.xml from child pom(s)

HIPPLUG-1155: Use latest plugin version, and document why we (temporarily) use a snapshot release pom dependency.

HIPPLUG-1110: svn ignores

HIPPLUG-1079: advance dependencies

HSTTWO-3249 Investigate behaviour of event listener spring overrides
- change spring config for Listener to avoid conflicts

HIPPLUG-1048 Unpublished taxonomies are shown in the site
- NOTE: old implementation is pretty much untouched, so, this will not brake existing (clients)  implementations
- demo uses snapshot version
- added 2 new interface methods:  org.onehippo.taxonomy.impl.TaxonomyManagerImpl.getTaxonomies(org.hippoecm.hst.core.request.HstRequestContext) and org.onehippo.taxonomy.impl.TaxonomyManagerImpl.getTaxonomies(javax.jcr.Session)
- 2 new Spring config properties: expireTimeSeconds and cacheSize properties
- added Guava cache to cache taxonomies per user (JCR session name)

HIPPLUG-1048 Unpublished taxonomies are shown in the site
- ignore IDE files

CMS7-8926: Update release pom to version 10.0.0-SNAPSHOT

HIPPLUG-987 updated gallerypicker dependency

HIPPLUG-972 fix bootstrap configuration for Hippo Plugin Taxonomy Demo.
Note though this is *only* an intermediate/temporary/incomplete fix as HIPPLUG-283 is also still open and seems to be causing an instable situation right now.

HIPPLUG-970: initial import of the taxonomy standard plugin for CMS 7.10, cloned (unmodified) from the Forge taxonomy plugin