* Hierarchical knit.properties files are introduced which are
  gathered while walking up the directory tree with the properties
  in knit resources being top-level ones.
* Freemarker templates for "knit.include" (top-level of example files)
  and "test.template" (test template) are introduced with locations that
  are resolved from properties.
* KNIT and TEST_OUT directives are not supported anymore.
 - Knitting is controlled by "knit.dir" and "knit.pattern" props.
 - "test.name" prop or TEST_NAME directive drives test gen.
* All markdown files are now clean of top-level knit-related boilerplate
  (only TEST_NAME directive is remaining in some)
* All example files are renumbered. It affects example-basic-xx,
  which had the legacy numbering with later insertions.
* All auto-generated files now have the correct source-file name
  specified at their beginning, due to consistent use of template
  substitution.
* No need to customize knit.pattern anymore (works out-of-the box)
* "knit.name" is automatically generated based on example's file name
  "example-basic-01" -> "exampleBasic01"
* Not match-pattern-group woodoo anymore, "knit.pattern" cannot have any
  user-defined match groups.
* No need to look for "package xxx" in knitted sources, as the
  example's package is always ${knit.package}.${knit.name}
* Simpler test names:
  testKotlinxCoroutinesGuideBasic01 -> testExampleBasic01
* Replaced END_TOC with END directive
* Build-scripts are improved:
  - Consistent code to use mavenLocal when snapshots versions are used.
  - Proper substitution logic to use Android AAR files so that Dokka has correct links to Google APIs.
  - Google repository is added to all projects.