Spring cleaning for /targetplatforms/ folder

Related to JBDS-3208, I'd like to purge all the unneeded old target platforms in [0].

[0] http://download.jboss.org/jbosstools/targetplatforms/

Specifically, this would involve moving and re-linking these into the equivalent folder under /static/ [1]:

[DIR]	3.62.0.Final-SNAPSHOT/
[DIR]	3.72.0.Final-SNAPSHOT/
[DIR]	4.20.5.Final-SNAPSHOT/
[DIR]	4.20.6.Final-SNAPSHOT/
[DIR]	4.21.3.Final-SNAPSHOT/
[DIR]	4.21.4.Final-SNAPSHOT/
[DIR]	4.22.0.Final-SNAPSHOT/
[DIR]	4.22.1.Final-SNAPSHOT/
[DIR]	4.22.2.Final-SNAPSHOT/

Then we can purge all the 4.{3?,4?}.*.*-SNAPSHOT folders for all the pre-Final builds; the rest should already be in /static/, but we can verify that and move any that are not already there. Really, we only need the handful of *.Final folders, and they should all be in /static/ [1].

[1] http://download.jboss.org/jbosstools/static/targetplatforms/

I believe we can also purge things like 4.40.0.Beta* from here [2]:

[2] http://download.jboss.org/jbosstools/static/targetplatforms/jbosstoolstarget/

But for that one we need to verify that rhn-support-pleacu doesn't still need them (ie., they're not used for an older JBTIS/JBDSIS Beta release build on Eclipse 4.4.0 / JBoss Tools 4.2.0.