represent classes in XML

See #85, release log:

• 1bea8b8 by @yegor256: #85 polished
• 8e6420c by @yegor256: #85 LCOM numbers
• c43295e by @yegor256: #85 LCOM numbers
• 1a5bef2 by @yegor256: #85 reverse for LCOM
• 2474e27 by @yegor256: #85 skeleton.xsl
• b4f2f45 by @yegor256: #85 finished
• 541e579 by @yegor256: #85 LCOM works
• c1e76a0 by @yegor256: #85 some tests fixed
• 15ded43 by @yegor256: #85 more tests
• d2f7afb by @yegor256: #85 skeleton.xsd, works
• 8296674 by @yegor256: #85 Skeleton
• 7e528ed by @yegor256: #85 show memory
• cfbacd4 by @yegor256: #85 show thread names
• 448ef9b by @yegor256: #85 show memory
• 6697124 by @yegor256: #85 refactored
• 4ef3ea7 by @yegor256: #84 show threads
• 733c294 by @yegor256: #84 test
• 33c008b by @yegor256: #84 simplified

Released by Rultor 1.67, see build log