Implement source sections compiler plugin

allows to compile only parts of the source files, denoted by top-level
"sections" (function with lambda param calls), but preserving original
file line/column numbers for easier diagnostics. Allow e.g. to compile
gradle "buildscript" section without preprocessing original file in
advance. See tests for examples.

non-compiler-tests/non-compiler-tests.iml

@@ -34,5 +34,6 @@
     <orderEntry type="module" module-name="idea-android" scope="TEST" />
     <orderEntry type="module" module-name="uast-kotlin" scope="TEST" />
     <orderEntry type="module" module-name="generators" />
+    <orderEntry type="module" module-name="source-sections-compiler" scope="TEST" />
   </component>
 </module>